An atmospheric, medieval-themed book store hides in a 13th-century underground space.

Memorializing the bravery of one young woman facing the monster of her age.

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

This crack in France's seaside cliffs once hid a sinister secret.

Guests can stay at a hotel in the former French abbey where lie the tombs of King Henry II and King Richard the Lionheart.

A neighborhood church's unusual abstract stained glass was the final project of avant-garde artist Jean Cocteau.

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

A unique zoological park home to over 30 species of wild cats, both big and small.

Folklore and history carved into Brittany's coast.

His "Lionheart" is entombed separately from the rest of his body.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

Figures of unknown origin carved into the surfaces of underground caves.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

Trek into the depths of the cave where 17,000-year-old paintings exist alongside 400-year-old graffiti.

Hundreds of dwarf beeches create an unusual, haunting forest in the north of France.

This ancient theater was once the home of fierce gladiatorial battles.

The encased skull that is widely believed to belong to St. John the Baptist.

An isolated 17th-century chapel on a remarkable site once dedicated to Celtic sun worship.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

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

This structure atop a craggy cliff in one of the most beautiful parks in Paris boasts an unbeatable view.

Since ancient times these picturesque springs have been providing bathers with healing waters.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

An ancient monastery, a locked room, and a mysterious book heist.