The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

This ancient structure is widely thought to be the oldest intact pyramid in the world.

Once a strategically imperative naval base, portions of this Bermuda dock complex now serve cruise ships.

The best place to send your postcards home from Antarctica.

Breathtaking and huge 430 year old maps of Italy.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

The ancient latrines of the Greeks, in all their public glory.

This artificial archipelago was supposed to resemble a map of the world.

A marvel of Byzantine engineering under the streets of Istanbul.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

This 23-foot-tall bear stands amid the hustle and bustle of Hamad International Airport.

The shallow, salty inlet was a safe haven for 19th-century pirates.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

Also known as the Great Mosque of Damascus, this is one of the world's largest and oldest mosques.

3D war panorama in Damascus built with help from North Korea.

Only a handful of these gorgeous historic waterwheels remain but even those are in danger from local unrest.

One of the world's best-preserved Roman amphitheaters is also one of the most unusual; it's made of black volcanic rock.

Amid the rubble of Aleppo's Old Quarter, part of a historic market has been restored and re-opened.

One of the oldest and largest castles in the world.

Ruins of the Crusaders' headquarters.

Mysterious lost empire of the Silk Road.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.