The Grand Casemates is a building in Grand Casemates Square, Gibraltar, that was originally a fortified barracks and casemate. It is beside Grand Casemates Gates, which leads through the former town wall.
Wikipedia https://en.wikipedia.org/wiki/Grand_Casemates
Address (Unnamed Road), Gibraltar GX11 1AA, Gibraltar
Coordinates 36°8'42.476" N -5°21'8.681" E