This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

A celebration of Colombia’s premier contemporary artist.

This colonial town in Colombia sits around the largest stone paved square in South America.

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.

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

This whimsical home made entirely from clay is basically a giant piece of pottery.

This elegant Colombian fortress was one of the torture headquarters for the Spanish Inquisition.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

One of the most exquisite Lycian hilltop citadels in Turkey.

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.

A sixth-century Byzantine cistern hidden below a modern carpet store.

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

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

Flames have been burning within this mountain for more than 2,500 years.

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

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

Turkish adventurer antiques in the heart of the Grand Bazaar.

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

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

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

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