Never mind... THIS is creepy. The Paris Catacombs
This is a picture of the Crystal Caves in Mexico.
This is the Salt Cathedral of Zipaquira, in Cundinamarca, Colombia. The entire room there is carved out of Salt!
The Lava Tube Cave in Tulelake, California. I think it looks like it's leading to fairy land.
The Reed Flute Cave in Guilin, China. I think this one looks like an Alien Planet.