What is left of the pillar of Saint Simeon, the voluntary martyr who climbed the column to give his sermons, remaining perched there for thirty-seven years.

One of the oldest and largest castles in the world.

Ruins of the Crusaders' headquarters.

Mysterious lost empire of the Silk Road.

A marvel of Byzantine engineering under the streets of Istanbul.

At this farm in upstate New York, the former president plotted his reelection campaign.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

Originally a meeting place for foreign correspondents and war reporters, the FCC remains an atmospheric spot for sunset drinks in Phnom Penh.

The capital of Cambodia is named after the hill on which this ancient temple complex stands.

One of the biggest markets in Asia, under one of the continent's largest domes.

A battle between nature and architecture in the Cambodian jungle.

Building Men of War and Indiamen from Holland's Golden Age.

A remarkable medieval structure born from a 14th-century disaster.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

Giant topiary dog once played a role in a terrorist bomb plot.

Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

The only museum with its curator—and her pets—buried inside.

Five candy-colored villages on the Italian Riviera.

Historic medieval fortified city in southwest France.

This ancient theater was once the home of fierce gladiatorial battles.