dungeon in medieval castle

access adventurous age ages ancient arched architectural architecture backdrop background basement bastion belowground brickwork building castle cellar cold construction cranny creepy dark defense dungeon eerie europe european explore fort fortification fortified fortress germany hall hallway heritage hide historic history inside medieval middle military mysterious mystery mystic mystical old oubliette passage passageway past place preserved ruin ruins secret shafts shining site spooky stonework sunlight system thrill tunnel tunneling underground walls way light