one of the corner watchtowers of the historic crumlin road jail that is now open as a modern museum and visitors centre

17th and architecture attraction basalt belfast black building centre century construction corner crumlin custody design detention doors exterior famous gaol gatehouse guided historic ireland iron jail jailhouse landmark listed lookout modern museum northern now observation old one open post prison prisoners project railings restoration restored road rock security stone stonework that tourist tours ulster victorian visitors walls watchtower watchtowers