The Mezquita del Cristo de la Luz is a tiny gem — a mosque built in 999 CE that is one of the oldest and best-preserved examples of Caliphate architecture outside Córdoba. It was built on the remains of a Visigothic chapel, converted to a church after the Christian reconquest in 1085, and later given the Mudéjar apse that juts out from one end. All three cultures — Visigothic, Moorish, Christian — left their marks on the same small building.
The nine-domed interior is based on one-ninth of the Great Mosque of Córdoba. The brick geometry of the arches and the horseshoe vaults are recognizably Caliphate style, filtered through the local Toledan tradition. The building is small — you can take it in properly in twenty minutes — but the layers of history compressed into it make it one of the most resonant spots in the city.
It sits just inside the old city walls near the Puerta del Sol gate, an easy starting point for walking into the old city from the north.