The foundation stone for the basic fortification was laid out in 1640. A year later, in January 1641, the fort saw its first battle, during the Catalan Revolt when the Principality of Catalonia challenged Spain's authority. (...) Later in the 20th century, the castle became a military museum. In June 1963, Francisco Franco inaugurated the Military Armor Museum, the official name given to the institution. In April 2007, the government transferred the castle to Barcelona City Council. Following discussions over the next months, the castle became a municipal facility. More information https://en.wikipedia.org/wiki/Montju%C3%AFc_Castle