This chest hospital with a dark, haunted past serves as a fitting set for horror films and a paradise for ghost hunters.

The abandoned ruins of a beautiful medieval castle just outside Barcelona.

An architect transformed this abandoned cement factory into his castle-like workshop.

A science fiction-inspired apartment building designed by a famous Spanish architect.

A surrealist labyrinth and museum of contemporary sculptures.

Barça football fans might see the insignia hidden in a church window as a divine sign.

A temple to modernity, tucked away amid Barcelona's more well known museums.