Montjuïc Castle is a fortress in Barcelona that dates back to the 17th century. And it has been involved in both the defense of Barcelona and its repression – repeatedly, over the course of centuries.
Research:

Behind the Scenes Minis: Piece of Work
17:48

E. Virgil Neal: Hypnotist, Fraudster, Tycoon, Part 2
41:22

E. Virgil Neal: Hypnotist, Fraudster, Tycoon - Part 1
35:28