Built by the Portuguese colonists in the early 16th century, this fort is one of the oldest European structure in Asia.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

An Austrian house of bones filled with hundreds of intricately painted skulls.

A sharp bend in a dramatic river canyon cut through red rocks.

These roaring primates were considered a divine creature in the cosmology of the Maya.

Site of James Cook's historic observations of the 1769 transit of Venus.

A lover's walk between hilltop towns, decorated with graffiti love notes.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

On La Gomera, "Silbadors" communicate in a 4,000-word language of whistles.

This underwater sculpture park is the basis for a manmade coral reef.

Hundreds of Buddhas in a re-discovered Indonesian temple.

One of Indonesia's tallest, this waterfall takes a 390-foot plunge into the Lake Toba caldera.

Site of the largest volcanic eruption in the last 25 million years, one which may have nearly wiped out humanity altogether.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

Natural arch offers panoramic views of Yangshuo's karst hills.

A small but immensely extravagant palace built by the "Night King."

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

A beautiful but toxic fountain of mercury.

This colorful statue welcomes visitors to a Barcelona park.

An early 20th-century bullring converted into a modern shopping center.

Tijuana's legendary jai alai or "basque ball" palace is now a massive music venue.

A tree grown from astronaut seeds which were exposed to cosmic rays.

Five candy-colored villages on the Italian Riviera.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.