A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

Collection of antique taxidermy and natural specimens, near one of Paris's oldest flea markets.

The Cimetière des Chiens et Autres Animaux Domestiques is one of the oldest pet cemeteries in the world.

This hidden workshop is filled with molds of France's most iconic sculptures.

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

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

A landscape decorated with enormous skull sculptures.

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

Sanctuary on a ridge near an ancient shrine to a "Black Madonna" built by the founder of Opus Dei.

An arresting arch punched straight through a mountain provides one of the most scenic spots, and challenging climbs, on the planet.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

Abandoned 18th century weapons factory in the Aezkoa Valley.

This tiny river island switches sovereignty every six months as part of a rare, centuries-old agreement.

The eclectic observatory castle of a 19th-century astronomer and explorer.

Winston Churchill painted this lake during his stay Woolsack Castle in the Landes forest.

French Time Capsule-19th Century home revealed to the public.

Before this bridge was built people had to wait for the ferryman, an annoyance that, the story has it, gave the town its name.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

This former limestone quarry is now a subterranean wonderland of grand stonework.

Despite centuries of architectural innovation, this French castle is being built like it's the 13th century.

A garden of massive sculptures sits in Jean Lindard's backyard.