Fantastic Pit, Ellison's Cave, Georgia

Fantastic Pit at Ellison's Cave, Georgia Ellison's Cave far under Pigeon Mountain in northwest Georgia. The cave's "Fantastic Pit," seen here, is the deepest cave drop in the continental United States at a staggering 586 vertical feet vertical meters).

~~Boynton Canyon 04-343 | Arizona by Scott McAllister~~

Boynton Canyon, Arizona, USA, by Scott McAllister. Believe it or not, there are some sensational things to see in Arizona not called the Grand Canyon.

Carlsbad Canverns National Park, Carlsbad, New Mexico, United States

Lechuguilla Cave

nmnomad: “ ruisu-kun-geosciences: “ Lechuguilla Cave, Carlsbad Caverns National Park, New Mexico, USA. Lechuguilla Cave is, as of June the sixth longest cave miles km)) known to.

Škocjan Caves, Slovenia by hk_traveller, via Flickr.  International scientific circles have thus acknowledged the importance of the Škocjan Caves as one of the natural treasures of planet Earth. They represent the most significant underground phenomena in both the Karst region and Slovenia.

12 Beautiful Pictures on Incredible Places - Škocjan Caves, Slovenia. From the picture, it feels as though we are in the bowels of the earth!

Entrance to Sintersee underground lake, Tropfsteinhöhlen Cave, Austria.

Entrance to Sintersee underground lake, Tropfsteinhöhlen Cave, Austria. We're close to Austria this year but I don't know if I'm brave enough to venture into a place like this.

Fairyland Caverns - Rock City, Lookout Mountain, TN. Really don't want to see it again. But is was nice to see once.

Cave weddings: super amazing, and super affordable

Melissani Lake - Kefalonia, Greece. In Greek mythology, Melissani was the cave of the nymphs. The cave features a lake that are surrounded with trees and forests. The cave is located east of the mountains of Evmorfia and Agia Dynati.

The Marble Cathedral In Marble Caves of Lake General Carrera, Patagonia, Chile

The Cave Bar in Lapad. Dubrovnik in Croatia on the Adriatic Coast

A Rough Guide to Croatia : Things to do in Dubrovnik City.

Cerkvenik Bridge in the Skocjan Caves - Karst, Slovenia. Going here when Robert gets back! looks awesome and only 2 hours away

Cerkvenik Bridge in the Skocjan Caves - Karst, Slovenia. Our tips for 25 things to do in Slovenia: Europe Travel Share and enjoy!