You can walk up Thailand’s naturally non-slip waterfall.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

Nestled in the heart of a Texas town is a dreamy secret garden dating back to the 1940s.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

Rare and gorgeous birds abound in this protected wildlife sanctuary.

World's smallest skyscraper, the product of a remarkable con.

Masterful ceramic fountain and map of the Pacific Basin.

This extensive collection of dead bugs may be the world's most idiosyncratic and personal insect museum.

A land of debatable treasure.

One of the most remote lodges in the Amazon offers rare wildlife encounters and undisturbed views of the Peruvian rainforest.

An unlikely beach paradise of giant sand dunes lies between two lakes just a few minutes from Michigan's cherry country.

Largest cave system in Africa.

This gem-encrusted temple is said to contain some of the Buddha's hair which can make the deaf hear and the blind see.

New York City's only wildlife rehabilitation center treats more than 3,000 feathered and furry patients each year.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

A massive, secret marina for the Nazis' most formidable weapon in the Atlantic.

You'll find the little birds tucked within the rocks of this Australian beach.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

Explore the quarry where the marble was sourced for Michaelangelo's David.

The largest known Ancient Egyptian obelisk.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

A striking symbol of the Bulgarian capital.

A rare kind of blue bear can be found chiefly in the national park that shares their name.