Beautiful carved tunnels.

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

A huge Megalithic chamber tomb located behind a cafe.

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

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

This imposing castle has stood for nearly a thousand years.

Exquisite examples prehistoric bas-relief carvings.

A quarry cum sculpture park where the works of art are chiseled into the very walls.

A massive, secret marina for the Nazis' most formidable weapon in the Atlantic.

This small commune with an even smaller name appears to have an unlikely amount of dead ancestors.

A former milk-delivery driver and his wife turn their home into a glimmering mosaic.

Europe's largest community of crocodiles and alligators.

This tiny hotel perched atop a 50-foot tower really puts things into perspective.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

The sunken structure looks like the victim of a catastrophic flood.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

Wall after wall of this French seaside neighborhood is intricately decorated with seashells and corals.

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

This Funeral Hearse Museum represents the finest in cadaver transportation.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

A total of 22 tiny bridges cross this canal of the Yvette River, forming a unique trail.

The remains of this ornate chapel now act as a portal to a cramped French cemetery.

A once drab public housing estate is transformed into a colorful gallery of trompe l’oeil murals.

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