Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

Ghosts of France's colonial past.

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

Sleep in a climate-controlled plastic bubble for the night.

The oldest and smallest cemetery in Paris is only open to the public twice a year.

Dedicated to the art of hunting, with juxtapositions of contemporary art.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

The world's largest reflecting pool is just two centimeters deep.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

This little-known relic crypt holds stolen parts of a Roman Empress.

Beautiful carved tunnels.

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

A mosaic-tiled house built by graveyard sweeper Raymond Isidore.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

In this Parisian garden's grotesque former life as a zoo it fed exotic animals to the bourgeois and put humans on exhibit.

Two small chapels housed inside an ancient tree.