Two hundred metres apart, on the same square in Zaragoza, stand two cathedrals. Not a cathedral and an important church: two real cathedrals, both in use, both belonging to the same diocese. It is a situation that exists nowhere else in the world.
I arrived in the morning, in July, and made the mistake almost everyone makes: I went straight to El Pilar, the one with the coloured domes you see from the bridges, and I nearly skipped the other. The other is called La Seo, it stands two hundred metres further east, and it holds the finest thing in the city.
How does a city end up with two cathedrals at the same time?
A four-century quarrel, closed by a papal bull
The answer is that for centuries they did not manage it peacefully.
La Seo, the Cathedral of the Saviour, was simply the cathedral. Santa María la Mayor del Pilar was a collegiate church with its own chapter, meaning its own separate and autonomous college of canons. Two institutions in the same city, with two administrations and two treasuries, spent generations quarrelling over money, cathedral rights and ceremonial precedence: who walked in front in procession, who celebrated what, where the offerings ended up.
The matter was settled in February 1676, when Clement X promulgated the bull In Apostolicae dignitatis and merged the two chapters into one. Since then there has been a single Metropolitan Chapter of Zaragoza, with two seats.
The way the merger is still staged strikes me as the most eloquent part of the whole story. Every 1 April the chapter moves house: the canons carry the liturgical stalls from one cathedral to the other and celebrate there for the following twelve months. A quarrel four hundred years long was resolved by ruling that neither building wins, and it is commemorated with an annual removal.
If this institutional coexistence interests you as a theme, it has an architectural precedent in Zaragoza at the Aljafería Palace, where the kings of Aragon built an entire floor on top of an Arab royal seat without demolishing it.
La Seo: a cathedral built on top of a mosque
La Seo stands where the forum of Roman Caesaraugusta once stood. A Visigothic church rose over the forum, the city’s great mosque over the church, and the Christian cathedral over the mosque, reusing part of what it found.
None of this is visible from outside, and not much of it from inside either: the building was reworked from the 12th to the 18th century, and it has Romanesque apses, Gothic naves, Mudéjar decoration and a Baroque façade. It is a cathedral that reads as a stratigraphy rather than as a design.
I paid the ticket without knowing what to expect, and for a quarter of an hour I thought I had wasted ten euros. Then I turned the corner of the choir and saw the presbytery.
The high altarpiece: sixteen metres of alabaster
The altarpiece of the high altar is the reason to see La Seo, and I struggled to stop looking at it.
It measures sixteen metres high by ten wide and is carved entirely in polychrome alabaster. It was executed between 1434 and 1480, in two phases by two different hands: the first is by Pere Johan, whose predella and bench survive, the second begins in 1467 with Hans of Swabia, who took charge of the three great central scenes. Francisco Gomar and Gil Morlanes the Elder later worked on the pinnacles and the crowning figures.
Pere Johan did not turn up here by chance. He had just finished the altarpiece of Tarragona Cathedral, commissioned by the same man: Dalmau de Mur, archbishop of Tarragona until 1431 and then of Zaragoza, who took his sculptor with him when he changed see.
It is worth knowing what that handover means, because you can see it with the naked eye. Pere Johan works in a Mediterranean Gothic tradition, with composed figures and clean surfaces; Hans of Swabia comes from the north and brings German Gothic, that is, broken drapery, movement and a taste for accumulated detail. The two manners coexist in the same object, one above the other, and the altarpiece becomes the place where you watch fifteenth-century Europe trading its craftsmen.
The alabaster does the rest. It is a translucent stone, and with the light falling from the cimborrio the surfaces do not reflect the way marble does: they hold the light and give it back dulled, so the figures look lit from within. Art historians rank it among the capital works of late European Gothic, and for once the textbook formula is not an exaggeration.
The cimborrio: three styles in a single dome
Above the crossing of the naves, and directly above the altarpiece it lights, is the cimborrio, the octagonal lantern that serves as a dome.
The present one was built between 1505 and 1520, and it holds together three languages usually studied apart: the octagonal structure and the brickwork come from the Mudéjar tradition, the ribs crossing into stars are Gothic, and the decorative details are already Renaissance. Looking up from below you do not see three superimposed styles but a single design, which is precisely what the builders of Aragon did best.
A practical tip: stand underneath and keep your head up for a good minute, because the geometry only opens if you give it time, and from any other point in the nave the cimborrio is lost.
The alabaster enclosures, white against gold
Around the choir run enclosures and portals carved in white alabaster, with a crowd of figures, coats of arms, scrolls and niches that goes on for metres without ever pausing.
The contrast with the presbytery is sharp and to my mind deliberate: the altarpiece is gilded and polychrome, these enclosures are white and monochrome, and the white lets the eye rest before it is sent back to the colour. It is also the point where you grasp how much alabaster passed through this site; the stone comes from the quarries of the Ebro valley, and it is the material that gave Aragon a recognisable school of sculpture.
The side chapels then hold painted altarpieces on gold ground, on a far smaller scale, which tell of another season in the cathedral’s life.
The Parroquieta wall, and why La Seo is a World Heritage Site
The most important piece of La Seo for the history of architecture is not inside: it is on the outer wall of the north flank, and you can see it from the street without paying anything.
It is the wall of the Parroquieta of San Miguel, Aragonese Mudéjar decoration of the 14th century: brick worked in relief into geometric motifs, green and white glazed ceramic set into the masonry, an entire surface treated like a textile. In 2001 it entered, together with the Aljafería and the church of San Pablo, the extension of the UNESCO listing «Mudéjar Architecture of Aragon».
Watch the date, because it is constantly misread: the original UNESCO inscription is from 1986 and covers the four Mudéjar monuments of Teruel. The Zaragoza monuments arrive fifteen years later, with the 2001 extension that brings the listing to ten components.
Aragonese Mudéjar has characteristics of its own, different from the Castilian or Andalusian kind: octagonal rooms, thick walls, glazed ceramic used on the exterior and wooden ceilings. If you saw the Aljafería in the morning and La Seo in the afternoon, you saw the same hand working first for a Muslim patron and then for a Christian one, two hundred years apart.
If you would like someone to explain all this while you look at it, there is a guided visit to La Seo lasting an hour and a half with entry included; the cathedral’s own labels do not do justice to what is there.
El Pilar: Ventura Rodríguez’s Santa Capilla
Two hundred metres to the west, El Pilar is the building everyone photographs and it is something else entirely.
The basilica is enormous, Baroque, bright and for the most part eighteenth-century. Its centre is not the high altar but a free-standing tempietto planted inside the nave: the Santa Capilla.
It was designed by Ventura Rodríguez, royal architect, whom Ferdinand VI sent to Zaragoza in 1750 to direct the works. He prepared the plans and elevations between 1750 and 1754, and the building went up from 1754 to 1765. It is considered a cornerstone of Spanish Baroque classicism, and the definition makes sense as you look at it: the decoration is extremely rich, but the structure beneath is symmetrical, measured and clear, and it never gives in to caprice.
Inside is the object the whole basilica exists for, and it is surprisingly small. The jasper column is 177 centimetres tall with a diameter of 24; the statue of the Virgin standing on it is gilded wood and measures 38 centimetres. Around those thirty-eight centimetres a tempietto and a basilica as long as a street were built, and four centuries of pilgrimage have passed.
Carlos Salas’s Assumption, which almost nobody looks at
Almost everyone stops in front of the Santa Capilla, queues for the column and leaves. They cross the back of the chapel without raising their eyes, and there is a relief there that deserves a pause.
It is the Assumption of the Virgin by Carlos Salas, in white marble, on the rear face of the chapel’s reredos. It is the most monumental of the reliefs Salas carved for the Santa Capilla, it was approved by the Real Academia de Bellas Artes de San Fernando in Madrid, and it cost 72,000 reales de vellón in 1767.
It is worth looking at the way you look at a painting, because it is built on two registers. Below, the apostles crowd around the empty tomb in varying attitudes of astonishment; above, the Virgin rises among clouds and angels, her drapery opening into a spiral. White marble on a white ground removes colour from the story and leaves only the relief, which is to say the light.
For the same chapel Salas also carved a Soledad, a Dolorosa, a Coronation of the Virgin and an allegory of the Church, the Monarchy and the Nation before El Pilar. All of them are on the outer faces of the enclosure, and you find them by walking around it.
Goya on the vaults, twice and twenty years apart
There is Goya in El Pilar, and it is not signposted as well as it deserves. There are two interventions of his, and it helps to look at them in chronological order because an entire career passes between them.
The first is the Adoration of the Name of God, of 1772, frescoed on the vault of the coreto, the Virgin’s small choir. Goya is twenty-six, back from a journey to Italy and trying to get himself hired: the result is brilliant and still obedient to the decorative language expected of him.
The second is the Regina Martyrum dome, of 1781, in the north nave. It is a different work, and not only because nine years have passed. It was the first time Goya had faced a hemispherical surface, that is, the problem of arranging a scene on a cap without the figures distorting, and he solved it without leaning on the usual perspectival tricks. In the four pendentives he painted the four Virtues, namely Fortitude, Patience, Charity and Faith, in pale tones. The dome was restored between 2005 and 2007.
One curiosity: in the summer of 2026 the preparatory sketches for the Regina Martyrum are not in the basilica but a short walk away, because they have been added to the exhibition «Goya. Del Museo al Palacio» staged at the Aljafería while the Museum of Zaragoza is being refurbished. Anyone visiting the city in this period can see the sketches in an Arab palace and the finished dome in a Baroque basilica on the same day.
The four bombs of 3 August 1936
Two bombs are on display on a pillar near the Santa Capilla. They are not a teaching replica: they fell there.
On 3 August 1936, fifteen days after the start of the civil war, an aircraft dropped four bombs at three in the morning on the basilica. None of them exploded. Two of those bombs have been restored and are on show inside the church, beside the flags of several American countries.
The episode was immediately read as a miracle of the Virgin, and the Franco regime turned it into one of its propaganda symbols. There is, however, also a technical explanation, and it comes from a report by the director of the Artillery Park of Zaragoza: the fuses were badly mounted and were calibrated to arm only if released from above five hundred metres, whereas the pilot, inexperienced, was flying at a hundred and fifty.
I find that the two readings, set side by side, say more about those years than either would say alone, and that is why it is worth stopping in front of that pillar.
Going up the Torre Mirador
Of El Pilar’s four corner towers, one is fitted out as a viewpoint and you go up by lift plus one flight of stairs.
From the top the city makes sense all at once: the broad green Ebro, the bridges in a row, the compact old town and above all the glazed tiled domes seen from above, with their yellow, green, blue and white lozenges. From the ground those tiles are a distant patch of colour; from up there they are a geometric design you can read tile by tile, and they are the same ceramic tradition as the Parroquieta wall applied to a roof.
Six euros for the tower alone are the best-value spend of the day.
Practical information
Data checked on 8 August 2026 on the official site catedraldezaragoza.es. Prices and hours change, and in two working places of worship they also change with the services: check them again before you travel.
Tickets. The single ticket costs 10 euros and covers four things: La Seo, the tapestry museum, the Rosario de Cristal and the Museo Pilarista. With the Torre Mirador added it costs 12 euros. The Torre Mirador on its own costs 6 euros. The reduced rate for 13 to 18-year-olds with a student card costs 7 euros, or 9 with the tower; the reduced rate for over-65s costs 9 euros, or 11 with the tower. Groups of 20 or more pay 7 euros. Free admission. Entry is free for children under 12 accompanied by an adult and for people with certified disability of 50 per cent or more. Entry to the basilica of El Pilar is free. You only pay for what surrounds the nave, that is the Museo Pilarista and the tower, while going in to see the Santa Capilla, the Goyas and the bombs costs nothing. Hours for La Seo and the tapestry museum. Monday to Saturday they open 10.00-14.30 and 16.00-20.00. On Sunday they open only 10.00-12.00 in the morning and reopen 16.00-20.00 in the afternoon. Last entry is 45 minutes before closing. Hours for the Torre Mirador. Monday to Thursday it opens 10.30-14.30 and 16.00-20.00. Friday to Sunday it opens 10.00-20.00 without a break. Last entry is 30 minutes before closing. Hours for the Museo Pilarista. It opens daily 10.00-13.30 and 16.00-20.00, with last entry 30 minutes before closing. The Rosario de Cristal opens daily 11.00-14.30 and 16.00-18.30. Hours for the basilica. These are worship hours rather than museum hours: Monday to Friday 7.30-13.30 and 16.30-20.15, Saturday 7.30-11.45 and 16.30-20.30, Sunday and religious holidays 7.30-13.30 and 16.30-21.30. The Santa Capilla area stays open daily 8.00-20.30. Getting there. The two cathedrals stand on the same square, two hundred metres apart, and you can visit both in one morning on foot. From the high-speed station Zaragoza-Delicias the old town is just under three kilometres away. How long it takes. Allow an hour and a half for La Seo, an hour for El Pilar and half an hour for the tower. A whole morning covers everything without rushing. The timetable trap. On Sunday morning La Seo closes at noon, two hours earlier than usual. Anyone arriving in the city on a Sunday and leaving La Seo for the afternoon is making the right call. Anyone counting on it at 13.00 on a Sunday finds it shut. An honest warning. The two cathedrals are not much alike and they appeal to different people. El Pilar is large, bright, full of people and of living devotion, and it is a place rather than a museum. La Seo is contained, quiet, almost empty, and it holds far more art. If you have time for one only, and you care about what this site is about, choose La Seo.
If you are building an itinerary through Aragon, the natural next stop is the Aljafería Palace, a kilometre to the west, which completes the Mudéjar argument. If instead you carry on into Catalonia, Barcelona has the tallest church in the world, the Seu Vella of Lleida is the cathedral that served 241 years as a barracks, and Girona tells of another medieval coexistence, and in Madrid the Reina Sofía takes the discussion of Spanish art into the twentieth century.
