Dungeon/Castle Tile, Iron Door, 9 Tiles, 3" x 3"

An enormous iron door is set into the floor.  Even if you can locate the key, or pick the lock, how are you going to open it?  And, is it wise to open a door so thick and imposing?  What's hiding (trapped) on the other side?

Steel door in dual-sided tile, plain on the other side.  Random textures, cracks, and colours.