The Cathedral of Alcalá de Henares (Madrid) is one of the most important in the world. Only exist two Cathedrals in the world where their clerics must be doctors of theology: the Cathedral of Alcalá de Henares and the Church of San Pedro (in Belgium).
Founded in 414 AD, in memorial of Justus and Pastor, now it become in a very charismatic building in the city.
Here you can se some pictures of this place.
Source: "Fotos Magistrales", from my Spanish blog Astaroth's World.