I may have to add these to my list of things to see!  Here are some of the worlds strangest natural wonders:

Moeraki Boulders, New Zealand
White Desert (Sahara el Beyda), Egypt
Sailing Stones, Racetrack Playa, Death Valley, Calif.
Travertine Pools at Pamukkale, Turkey
Salar de Uyuni, Bolivia

Here are a few others:

Asbyrgi Canyon, Iceland

Lake Retba, Senegal

Marble Caves, Chile