A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

This famous city eluded concrete detection until the early 2000's.

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

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

Besides being home to cave paintings and pre-Columbian Cuban archaeological remains, you get to take a boat through this stalactite and stalagmite covered cave.

A Cuban artist reclaimed his impoverished neighborhood as a dreamy folk art kingdom.

A focal point of the Cuban government, this city square features one of the most iconic images in the country.

Once a favorite playground for the world's most illustrious guests, Hotel Nacional's secret weapons and bunkers reveal a more menacing side to its golden history.

A colorful narrow alley in Cuba is full of street art and sculptures made of found objects.

No one knows the meaning behind this giant sculpture of a nude woman with a fork riding a rooster in Havana.

This statue in Plaza San Francisco commemorates a beloved figure from 1950s Havana.

An old slave lookout in Cuba's historic sugar cane fields.

This imposing memorial contains the remains of Che Guevara — and 29 other guerrillas who died with him in Bolivia.

A Turkish ghost town abandoned in a population exchange with Greece.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

Hidden just under the waters around this Turkish island are the ruins of a once great city.

This arch granting triumphal entrance into Antalya was designed to honor the emperor's visit.

Roman ruins top white travertine terraces formed by ancient hot springs.

A deadly ancient portal to the underworld.

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

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.