A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

A spectacular cave and a beguiling lake.

This legendary city has been a tourist attraction for centuries.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

The hallucinogenic center of the ancient world.

Home to three historic ships from the age of Vikings.

This 14th century wine cellar is home to the oldest barrel-stored wine in the world.

The Sun King's military models, saved from the Louvre.

A museum which takes visitors to the côté obscure of Paris.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

This frog-themed restaurant was frequented by Picasso, Saint-Exupéry, and more.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

Indents in the pavement are all that remain from a grisly death machine in Paris.

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