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Located on the Plaza de la Seo, the cathedral is referred to as la seo ("the see") to distinguish it from the other cathedral, el pilar. La Seo has originally been constructed one the site one of the first mosques during the Moorish domination of Aragon, built perhaps as early as the 8th century, and destroyed to make way for a romanesque church in the 12th century. Zaragoza became an independent diocese in the 14th century and the church became its cathedral, immediately being afforded renovations in the gothic and moorish (mudéjar) styles. Many other reconstructions followed, due to both changing tastes and architectural necessities, as parts of the cheaply-built cathedral began to fail over time, including a collapse in the 15th century.
In the 17th century, the church has been involved in a canon law battle with the newly-reconstructed Basilica of Our Lady on the Pillar over which should be the seat of the diocese and thus the cathedral, which finally saw Pope Clement X declare them joint cathedrals with special provisions to make sure both enjoy equal status. La Seo is now a mixture of styles spanning between 12th and 19th centuries, and features an exquisite collection of tapestries. Entrance closes sometimes during the day when there's mass.

Museum displaying a collection of Goya and temporary exhibitions. (March 2026: temporarily closed.)

Almost everything here is from the era of the emperor Tiberius: it was the site of the original forum from Augustus' time, but it was all demolished after the river flooded, and materials from it were used as filler when raising the street level 4-7 metres, and building a bigger one. As well as models of the two versions, there's the opportunity to walk along a Roman sewer.

Distinctive for its square tower and polygonal apse, la Magdalena stands out within the old town of Zaragoza as one of the few relatively intact examples of Mudéjar architecture of the 14th century. That said, its interior was renovated in the baroque period.

The more famous of the two cathedrals is the one on the bank of the river Ebro. Holding an additional rank of basilica, this cathedral venerates the Virgin Mary who reportedly appeared to Saint James the Apostle on said riverbank during his travels in Iberia. Mary appeared on a pillar, which led to her being venerated under this particular name and also gave origin to the unusual Spanish female given name Pilar.
Saint James is believed to have had a small shrine constructed by the pillar, of which nothing remains, but subsequently a large basilica was built on the site in the 3rd century under the rule of the Roman Emperor Constantine. This basilica has been rebuilt over the years, and became a Gothic church in the 15th century. The present-day version of the church superseded it and was constructed on the orders of King Charles II of Spain between 1681 and 1872. The protracted construction has been caused by frequent redesigns, including a reorientation, additions of towers and cupolas. It also allowed for the domes to be painted by Francisco Goya a century after the construction started, and the vault paintings are now one of the main attractions on the inside of the cathedral.