At this ancient settlement at the foot of Mount Babadağ, honeycomb tombs are carved into a round cliff.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

This Turkish cave boasts some rather bizarre associations with the King of Mount Olympus.

The best-preserved ancient theater in the world.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

Naturally protected city carved from a rock face.

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

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

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

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

Towering high above the neighborhood of La Candelaria, the church is easily recognizable by its distinctive red-and-white striped facade.

A museum built around a bus-sized fossil on the side of the highway.

An inspired museum dedicated to the patron saint of enslaved people, inside the cloisters where he lived and died.

The colonial city's social history is reflected in its fanciful door knockers.

Known as the site of 'El Dorado,' this mysterious lake is rumored to hold gold beneath its waters.

Perched atop the highest hill in Cartagena, this 17th-century convent offers spectacular views of the city.

This Bogotá museum houses the world's largest collection of pre-Columbian gold relics.

This tiny shop has been serving traditional tamales for more than 200 years.

A cozy bookstore and coffee shop in the heart of Cartagena's Old City.

Cathedral carved out of salt, located a mile below the earth's surface.

A little known Colombian theme park of giant curiosities.

Colorful lights and mirror-like brine pools create trippy illusions within the historic mine.

Enchanting cave with a river crashing through the roof.