France's most famous cemetery, with some of its most curious tombs.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Ruins of a Carnegie family mansion on Cumberland Island.

You'll find just about anything in this funky Tbilisi flea market.

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

The last standing example of an ancient district's teatime tradition.

Luxury hotel turned into a refugee camp, then turned back into a luxury hotel.

A museum glorifying the life of Stalin, located in the city of his birth.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

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

Unusual building appears to be haphazardly built from randomly piled bricks.

Fortified homes of highland warriors that are still in use today.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

Underground monastery and fortress.

Ancient rock-hewn town that witnessed key events of Georgian history.

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

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

A spherical "micro-nation" in the heart of Vienna.

This museum promotes informed contraception by documenting its often secret past.

This Austrian museum celebrates the work of famous forgers and their inimitable imitations.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

A sudden, striking cluster of hills south of Padua has been attracting visitors for centuries.