Seville Cathedral (Catedral de Santa María de la Sede) is the world’s largest Gothic church and, according to some, the 3rd largest church in the world. Built on the site of a medieval mosque, and with clear Islamic influences (including a minaret transformed into a bell tower), the cathedral is a must-see site for all visitors to the city. Come to see the tomb of Christopher Columbus, the bizarre stuffed crocodile relic, or take a guided tour of the cathedral’s roofs.