Enchanting cave with a river crashing through the roof.

The Andean town where every single building is decorated with a brightly colored frieze.

This naval gun is fired every day at noon, an odd timekeeping tradition the origin of which is local legend.

A serene space tucked amid the skyscrapers of Hong Kong's bustling financial district.

Taoism, Buddhist and Confucianism are all represented in this temple that claims to answer anyone's wishes.

A beautiful deserted greenhouse in the middle of a park.

Hoax, mistake, or evidence of dinosaurs in human times?

5,000 skulls in memorial to those killed by the Khmer Rouge.

A battle between nature and architecture in the Cambodian jungle.

This historic black and white monastery is one of Bulgaria's architectural jewels.

A 125-meter long "tribute to the Brazilian people."

This massive Brazilian church is built like an angular, technicolor pyramid left by Mayans from the future.

Eduardo Kobra’s breathtaking 32,300-square-foot graffiti wall took over Rio’s Olympic Boulevard.

There is only one place in the world where the corners of four nations come together.

Spanning over 10,000 square miles, this ancient salt pan is one of the largest on the planet.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

The place where World War I began.

Bridge that died in war and was resurected.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

An important Mayan religious and trading center dating back to 200 BC.

This portion of a lovely Belize beach is infested with (harmless) sharks and rays.

A massive underwater sinkhole made famous by Jacques Cousteau.

Climb inside an iron crystal magnified 165 billion times its normal size.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.