Where?: Seville is the capital of Andalusia, Spain's most southern city. It is connected to Madrid by the AVE high-speed train.
Read more about Seville
Built: 15th and 16th centuries. The Giralda bell tower, a part of the mosque that formerly stood on this site, is from the late 12th century.
What's Inside?: The largest altar in the world, the tomb of Christopher Columbus
Practical Information: Entry costs a little under 10€.
Website: Catedral de Sevilla