10 Underground Wonders of the World!

So, during class today I decided to wander aimlessly around on the Internet and I found this article in my "not paying any attention what-so-ever ten minutes" and thought I should share. Pretty awesome. Definitely will be visiting these places. Here's the article:

http://travel.yahoo.com/ideas/10-best-places-to-explore-the-underworld.html


And the places, cut to the chase, just in case you don't feel like browsing through the pictures:

Waitomo Glowworm Caves, Waitomo, New Zealand
Puerto Princesa Underground River, Puerto Princesa Subterranean River National Park, Philippines
Seattle Underground, Seattle, Washington
La Ville Souterraine, Montreal, Canada
Colosseum Hypogeum, Rome, Italy
Ainsworth Hot Springs Resort, Ainsworth Hot Spring, Canada
Wiezliczka Salt Mine, Wieliczka, Poland
Caves of the Thousand Buddhas, Dunhuang, China
Fremantle Prison’s Tunnels, Fremantle, Australia
Canal Saint-Martin, Paris, France