Actually, Tombstone is the only maze that even closely fits with the surrounding area. Coney Maul is themed to a dilapidated carnival, yet its attractions include a haunted mansion, haunted hospital, psychotic prison, and backwoods trail. And Waste Land, which used to be themed to a government outpost overrun with aliens, hold a slaughterhouse, a vampire bar, a farm with rabid scarecrows, and a werewolf-infested forest.
So where does that large warehou...err, Ancient Cave come into play?
But seriously. I love it when I find ancient ruins in my river themed amusement park areas.