This structure among the trees was the result of divine inspiration.

Visit this playground of waterfalls, caves and sinkholes.

The central mosque of this Mali town is entirely built from mud.

More than five miles of underground passageways.

These homes carved into the mountains seem to defy the laws of nature.

Topless shrine of northern Ghana.

One of the most spectacular canyons in the world.

Hundreds of caves once used to store grains and animal feed.

Life's work of sculptor Elisabet Ney remains preserved in her last studio.

DIY collection of eclectic holdings.

One artist's yard is full of shining, whirling kinetic sculptures that look like pure steel psychedelia.

This failed condo development was reborn as a street art hub.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Rustic natural hot springs in the deciduous rain forest.

Hollowed out cedar log tubs set in an ancient towering forest.

An emerald-green grotto just a short trip from Austin.

Geothermal waterfalls in Tuscany.

A hard-to-reach oasis in a desolate corner of Death Valley National Park.

This Japanese-inspired labyrinth of hot springs is hidden in a Chilean forest.

An independent naturist colony amidst 1000-year-old ruins.

Community owned and operated, this property is home to a diverse set of nudists.

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

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

Numerous impressive carvings are embedded in the trees lining this street in Marrakech.