A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Geothermal waterfalls in Tuscany.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

Five candy-colored villages on the Italian Riviera.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

Bronzes and busts that once stood in the city's main squares are now relegated to a small hidden courtyard.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

What happens when you cross a mayor and a painter?

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

A naturally beautiful, seemingly bottomless deep blue spring.

A medieval bridge stretches over a sulfur-rich river that leads to year-round natural hot springs.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

A modernist landscape of water and sci-fi concrete.

Profile of a sleeping person four kilometers long in 250-meter-high cliffs.

One of the Eight Wonders of Kansas and the first official National Natural Monument these stark formations look like nature's Stonehenge.

A museum of unusual collections, mini-towns, and a half-dog, half-alligator.

Thousands of unique minerals, including some of the most impressive fluorite crystals in the world.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

"Only the devil could play golf here."

A six-ton, 12-foot-tall concrete prairie dog is touted as the largest in the world.

The world's largest Holstein cow.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

This erect, phallic geological spire wasn't always named so domestically.