A crumbling island fortress that seems to be covered in a field of stone crosses but is simply incomplete.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

An abandoned beach resort in Normandy reclaimed by artists.

Fighting the British and making game shows for over 150 years.

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

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

This bridge was constructed from the rubble of the infamous Bastille.

The Church of the Annunciation was carved into the face of a cliff, just like the rest of the town of Haute-Isle.

Exquisite examples prehistoric bas-relief carvings.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

Limestone grottoes turns everyday objects into stone.

The remains of 40,000 humans, meticulously stacked in a tiny churchyard shed.

Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

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

Beneath the city of Lourdes, France is a massive, concrete church.

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

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

An underground city of ancient quarry tunnels hid thousands of Allied soldiers in WWI.

The post-apocalyptic remnants of a bucolic town ruined by a plane crash.

An icy lake tucked among jaw-dropping alpine panoramas.

1920's reinforced concrete church by architect Auguste Perret changes the face of modern design.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

These crumbling Nazi artillery bunkers are now fair game for massive graffiti projects.

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.