Unseen Sahara

My close friend Alf Seegert sent me this one:

Unseen Sahara
A rare aerial look at Libya's remote Fezzan region, where ancient societies thrived and collapsed as the rains came and went.

http://ngm.nationalgeographic.com/2009/10/fezzan/steinmetz-photography

Hall's Bay Arch Waterfall

Hall's Bay Arch Waterfall, Utah

(Yeah, ok, so I like waterfalls with arches over them. :-)

Ófærufoss

Ófærufoss is a waterfall situated in the Eldgjá chasm in central Iceland. Until 1993 a natural bridge spanned the top of the falls, but it collapsed after a violent storm.

Tushuk Tash a.k.a. Shipton's Arch

Tushuk Tash (天洞), a.k.a. Shipton's Arch, China, the tallest natural arch in the world at 1200 feet.

Discovered in 1947 by famed british explorer Eric Shipton, then dropped from the Guinness Book of World Records because it's existence could not be verified. Rediscovered in May 2000 by National Geographic.