The water in this preserved area spawns vegetation that gives it a deep green color.

Buddha shrines hide within dark tunnels at this unique forest temple.

Bangkok celebrated its shifting monarchy with a militaristic homage to democracy.

For centuries young Thai men used this Giant Swing as a slingshot to heaven.

Fantastic views and thousands of love locks.

This magnificent church allows travelers along one of Germany's busiest roadways a chance to rest and reflect.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

World's largest barrel containing an inn.

It's good luck to be mocked by this monkey.

Moorish signal station on a stratgic rocky outcrop.

A Spanish town built into the cliffs.

The hidden ruins of an old hydroelectric plant reclaimed by nature.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

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

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

The two massive guns that defended Cartagena Bay.

This portrait of Philip V is always hung upside down, in a protest three centuries in the making.

More than 2,000 species of tropical plants call this nature preserve and sanctuary home.

This legendary urban waterfall creates a dazzling display of rainbows.

These ancient sacred grounds granted amnesty to those who managed to reach them.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

At the base of Steens Mountain resides an otherworldly desert.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.