I'm going to use this post as a way to dump unusual ideas for maps. Feel free to share your own as well.
So, here are some unusual maps that I've either made or am planning to make:
-Bowling alley (Planning on doing this one soon)
-Chess board (I have this one made already)
-Monopoly Gameboard (This I will probably not attempt but it's a crazy idea)
-Mall map (planning on this one--- it even has elevators)
-Starship (I attempted this once but didn't get far...)
I don't think any of these maps are out there yet. Do feel free to take inspiration from above ideas... except the chess map, since that one's finished.
What other odd map ideas can you come up with? I love weird maps, haha. XD