This natural rock "church" might not be a proper chapel but that doesn't mean it's not beautiful.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A collection of mechanical beasts with some interesting names.

These etchings reveal the history of a long-gone quarantine site.

A castle inspired by medieval architecture is hidden in the woods of Connecticut.

A few stone foundations and an old graveyard are all that is left of this once thriving settlement in the wilds of Connecticut.

With some 500,000 books across five buildings, this bookstore is a reader's paradise.

Amazing views of Long Island Sound can be seen from this mountaintop tower.

Ride the rails on a train harkening back to a 19th-century marvel.

These unique markers designate the route American forces took during the Liberation of France.

The vibrant buildings in the “capital of the comic strip” celebrate the art form that made it famous.

A medieval house adorned with enigmatic carvings, including one of a man displaying his masculine attributes.

This French chateau is home to the world’s largest private collection of fighter jets.

This Corsican Neolithic site is full of pre-Roman megalithic structures that may or may not be penises.

These colorful French islands spent a stint bootlegging booze during American Prohibition.

Exquisite examples prehistoric bas-relief carvings.

One of the great treasures of Neolithic art lies within this carefully constructed pile of rocks.

French commune at the heart of conspiracies.

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

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

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

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

The Argonaute submarine was the French navy's pride and joy in the 1950's.

An enchanting work of outsider art, full of whimsical sculptures and carvings.