The decaying remains of a once-luxurious Soviet spa town.

Fast food feels like fine dining at this award-winning modern Georgian building.

These eight mummies are the best-preserved human remains ever discovered in North America.

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

Small church on top of a huge rock column.

Underground monastery and fortress.

Experiencing Guatemala's sensory-exploding church is a blunt reminder of European influence.

Mesoamerican monoliths and zoomorphic stones covered in royal visages, ancient mythology, and grand celestial events.

A ruined Maya city that suffered a years-long case of mistaken identity.

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

A late-night restaurant empire was launched from this humble storefront.

This 13-foot smiling peanut in Georgia helped Jimmy Carter win the 1976 presidential election.

This fascinating abbey is considered the oldest monastery in the region.

This 12th century, partially destroyed, abbey has had several owners and was seized during the French Revolution.

A fortified palace in the shape of a ship on the Thiou river.

A functioning Roman-era aqueduct and bridge in rural southwest France.

This prehistoric figurine is the oldest known realistic depiction of a human face.

The castle where the Marquis de Sade lived out his darkest fantasies.

A fortress on this island housed the mysterious prisoner known as the "Man in the Iron Mask" for more than a decade.

A medieval church built into an ancient cave.

Immortalized by artists, this church incorporates a medieval lighthouse into its shoreside structure.

Medieval Danse Macabre Fresco in Northern Brittany.