a bastion with a highly secure door, steampunk bronze and stone, battle tested, 2D flat 
a bastion with a highly secure door, steampunk bronze and stone, battle tested, 2D flat --version 4
a bastion with a highly secure door, steampunk bronze and stone
battle tested, 2D flat
an illustration of a steampunk door
an illustration of a steampunk building
an illustration of a door in a dark room
a 3d model of a small building with a door