Gothans Citadel is a mysterious structure upon Barsoom it is where the warhoon Gothan spent his final days! The area it is situated in is painted to appear as a deep gorge when viewed from above (presumably by Gothan who has made a hobby of painting) and the citadel itself is camouflaged against the mountains. The stairs at the base of the citadel are completely nonsensical labyrinth, it seems as though the only option is to climb the tower and ignore the steps entirely!