An extraordinary "City of Caves" carved from solid stone.

This restaurant is proud to be built atop a burial ground.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

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

One of the world's largest pyramids stands within El Mirador, the "lost city of the Maya."

Climb inside an iron crystal magnified 165 billion times its normal size.

The fire inside this temple has burned for more than 1,500 years.

A dreamy mausoleum honors Persia's most famous poet.

A spectacular rainbow of stained glass makes the "Pink Mosque" one of the most beautiful in Iran.

This sacred fig tree with a link to the Buddha is one of the oldest human-planted trees in the world.

Seven beautiful 1,000-year-old rock-cut Buddhist statues.

This elaborate temple was built around one of the Buddha's teeth.

A monument to the conquistador became increasingly controversial in the very city that he founded.

The little bear in the "funny kind of hat" has made his way from London back to Peru.

The depictions of slaughter are surprisingly detailed at this mysterious ancient site.

This stone complex marks the urban center of a lost civilization.

The remains of what was the most important religious complex in coastal Peru for over a millennium.

Death rituals and sacrifice inside a Peruvian megalith.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

Huge stone depressions which may have acted as an Incan agricultural experiment.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

A market for witches is hidden within a train station.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.