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One of the oldest Moorish monuments in Spain, this tiny 10th-century mosque was built over a Visigothic chapel then converted into a church by King Alfonso.

The Mezquita of Cordoba is a beautiful and fascinating 8th-century mosque known for its forest of columns and striped arcades.

This large and important mosque on the Temple Mount was originally built in 710. It features 11th-century mosaics, a 12th-century mihrab, and Romanesque arches added by Crusaders.

Once a mosque and now a museum, the Hagia Sophia was originally a Byzantine cathedral, built in 537. It is universally acknowledged as one of the great buildings of the world.

Built over the square site of a mosque, Seville Cathedral is the largest Gothic building in the world. It is an impressive architectural expression of post-Reconquest confidence.

This historic 7th-century mosque stands on a site that has been sacred since 1000 BC. It has medieval mosaics on the facade and a shrine to John the Baptist inside.

The Agia Sophia is the largest and most famous Byzantine church in Thessaloniki, Greece. Built in the 8th century, it was modeled after the more famous 6th-century version in Istanbul.

A massive round building that was first a Roman temple, then a Christian church, then a mosque.

Originally a church, this synagogue in Coptic Cairo was sold to Jews in 882. It was frequented by Maimonides and became a place of pilgrimage.

The Cathedral of St. Nicholas in Famagusta was built in a pure High Gothic style in the 14th century and later gently transformed into a mosque.