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

This bridge made famous in a novel and on-screen wasn't actually built over the river Kwai.

Acres of salt crystal pyramids dry in the sun along Thailand's "salt road."

A limestone wonderland of water and subterranean secrets.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

Thailand's distressed elephants find peace at this Chiang Mai sanctuary.

Six times a day a train runs right through the middle of this Thai street market, sending vendors scrambling.

Slum Settlement Filled With Mountains of Garbage.

The place where World War I began.

Humble beginnings for one of the world's most famous scientists.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

Horse cemetery on the grounds of Blarney Castle.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

Constructed during the 1960s, this bridge is still the highest in Italy.

Not far from the more famous House of Juliet, visitors will find the supposed residence of her lover.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

One of seven Jewish catacombs in Rome and one of only two open to the public.

Venice's "Island of the Mad."

Over time, this castle grew to encompass the entire island.

The largest wine cellar in the world is a 150-mile network of underground caves near the capital of Moldova.

Get in line for Lisbon’s most famous sandwich.

Eat the ultimate iteration of Portugal's most beloved pastry.

A whimsical bridge adorned with decorative dragons.

A painting to honor the oldest reserve squadron in the Royal Air Force.