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:

Unearthed! In Spring 2026, Part 1
43:14

SYMHC Classics: Gustave Courbet
40:51

Behind the Scenes Minis: Oh, Kropotkin!
17:28