A uniquely beautiful building whose five naves are separated by stone columns supporting delicate horseshoe arches. The walls are starkly white. It most resembles a mosque, though it never was. You'll see fine examples of decorative plasterwork and blind arches inside. It was built as Toledo's main synagogue in 1180 (4940 in the Jewish calendar), but as a result of Saint Vicente Ferrer's anti-Semitic preaching, it was commandeered and converted into a Catholic church at the beginning of the 15th century. It later fulfilled many functions before falling into a terrible state of disrepair. Fortunately, it has now been restored to its former grandeur and is open to the public. Closed on Christmas Eve, Christmas Day, New Year's Eve and New Year's Day.