Carved fountains poignantly placed in parks and in front of special monuments.

Single runway interrupted by a busy road that cuts across its middle.

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

Monasteries on rock pillars, once accessible only by frayed ropes.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

Also known as Uncle Karl, the beloved bronze copper keeps a watchful eye on St. Stephen’s Basilica while people rub his lucky belly.

On a cornerstone of the City Museum is the head of a monstrous serpent stolen from an Aztec pyramid 400 years ago.

This massive rock column in Canada is perched on a corner of its base, seeming to defy gravity.

When in Idaho, sleep in a giant potato.

The topiary maze at the Habsburg hunting lodge.

An eclectic Buddhist temple packed with pop-culture icons.

This French colonial post office is arguably the grandest in all of Southeast Asia.

The gardens and chambers of this Moorish citadel conjure memories of the Alhambra.

This Moorish fortress has guarded Málaga from the slopes of Gibralfaro hill for nearly a thousand years.

The world's most active stratovolcano is almost always erupting.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.

The last surviving submarine from a strange chapter of Finnish history.

A subtle memorial marks where a human chain protested Soviet control in 1989.

A tribute to the man who lit himself on fire and ushered in the Tunisian Revolution.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Perhaps the most spectacular grotto along the Algarve coastline.