The Garni Gorge

[Mr. Analog]

"(T)he Garny Gorge is made out of a high number of basalt columns. It?s an absolute must-see if you find yourself in Armenia."

Incredible natural structures.

http://www.odditycentral.com/pics/the-garni-gorge.html

[Darren Dirt]

Incredible man-made structure:
http://www.odditycentral.com/pics/worlds-largest-swimming-pool.html

More like a lake, but hey it's maintained like a pool so puhtaytoe puhtatoe...



Then again, there's ^ coolness ^ ... and then there's stupidity:
http://www.odditycentral.com/pics/taking-a-swim-in-the-devils-pool.html

http://www.blog.joelx.com/devils-swimming-pool-victoria-falls-zimbabwe/868/ (source, apparently -- has some comments)

(Google Maps)