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

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

A castle-like sea fort from the 17th century is now a museum to oyster farming.

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

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

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

The ruins of a medieval castle linked to the murderous French lord that inspired the famous legend of Bluebeard.

This miniature Paris, built out of trash, is one man's two decade labor of love.

The deserted pirate-themed restaurant still entices explorers.

There is a strange little carving of a person seemingly crushed by a pillar behind the remains of St. Thomas Aquinas.

This submersible road connecting a French island to the mainland is lined with safety towers for when the tide strands travelers.

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

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

An aluminum skeleton brings Chinese mythology to the French shore.

These red marks, seemingly placed at random, are in fact not.

A quaint medieval harbour where Benjamin Franklin landed in 1776.

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

A remote hilltop covered in giant monoliths haunts the Brittany countryside.

A granite rock formation littered with various species of moss, lichen, and fern.

Medieval Danse Macabre Fresco in Northern Brittany.

Old vessels have been transformed into artistic canvases in this unusual cemetery.

The birthplace of the ferocious William the Conqueror, this castle is awash in medieval history.

Personal garden filled with mosaics made of recycled garbage.

These ancient sacred grounds granted amnesty to those who managed to reach them.