Nature

The largest dam in the world and the site of a potential disaster.

One of the longest wooden benches in the world snakes around Geneva's Treille Promenade.

Glacial lake that mysteriously empties itself every year.

Mysterious spherical rocks in the semi-desert of western Kazakhstan.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

Splashes of blue in an otherwise monotonous lunar landscape.

An artificial crater field that trained astronauts for lunar exploration.

"Alleys of Stone" form natural mazes in Spanish natural park.

A humid oasis combines recreation with exploration in a unique underwater cavern.

The only freestanding table rock formation east of the Mississippi.

A remarkable geological formation resembling a forest made of stone.

Once a year, ambitious surfers can ride the world's largest river.

This strange hill on Old Fort Road where gravity works in reverse has been fascinating locals for years.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

Sniff the Titan Arum's rotting flesh.

Read a book next to a Midtown waterfall.

The L.A. Zoo has a secret garden of rare bootleg cycads, a palm specimen dating back 280 million years.

A bike being "eaten" by a tree is the real Vashon legend behind popular children's book, "Red Ranger Came Calling."