A bike train runs along a disused railway line through the tranquil French countryside.

A swath of France so devastated by war it is still forbidden to go there.

This Parisian gem is one of the most incredible ethnographic museums in the world.

The famous winding walk at Chartres is surrounded in mystery and myth.

An icy lake tucked among jaw-dropping alpine panoramas.

Ancient paintings known as the "Sistine Chapel of Cave Art."

The curious underground history of keeping Paris clean.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

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

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

Paris' linguistic guide to the international language of, yes, love.

This massive library holds what was once the largest book collection in the world.

Giant, pink stuffed rabbit on an Italian mountain.

Avant garde house of Pierre Cardin on the Cote d’Azur.

One architect's organic, human-centric design has been fully realized in this alien art house.

This massive blockhead sculpture hides an entire library.

A medieval military street hidden beneath a charming French fishing village.

Tens of thousands of ancient rock carvings hidden in the heart of a French national park.