Dating back to the second century, vestiges of prehispanic mural paintings are found in this underground palace.

A striking depiction of Teotihuacan's mysterious "Spider Woman."

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

The former headquarters of Mexico's Secretariat of Public Education now houses a muralism museum, including Diego Rivera's first large-scale mural project.

A bronze statue of the famed Prussian naturalist commemorates the year he spent in Mexico.

This mid-century mural portrays humankind's spiritual and scientific journey.

A gigantic, symbolic artwork covers the side of the building.

The turquoise-studded skull of a long-dead Aztec man sits within Mexico City’s Museum of Anthropology.

Underneath the historic center of Mexico City, the remains of a temple dedicated to the Aztec god of the wind.

This incredible college library is a visual masterpiece of mosaic art. It also looks kind of like a giant boombox.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

A museum in the former home of Marxist revolutionary Leon Trotsky.

These haunting ruins of a 700-year-old Prehispanic city have witnessed centuries of wars and massacres.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

The famous artist couple lived and worked here, in two different houses connected by a bridge.

Over 60 chemical plants and oil refineries sit in a 15-mile-wide section outside town.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Standing proud atop a Turkish bluff, this Ottoman palace has retained its grandeur despite being abandoned for centuries.

Natural rock formation, or biblical artifact that saved Earth's wildlife two by two?

An ancient church on a tiny island covered in stone bible stories has controversially been turned into a museum.

A Turkish monastery tucked into a cliff wall.

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

This Ottoman bridge is a rare covered bridge with shops, and considers itself the only bazaar bridge in the world.