An unusual sand beach in the middle of a forest.

Jean Tinguely's bizarre monster sculpture is hidden deep in a forest.

A unique military outpost carved into a rocky outcrop in the English Channel.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Journey through the ruins of this ancient Roman temple dedicated to the god of war.

The precise origins of this pink sandstone temple are unknown.

Admire endangered plants in a verdant garden that looks straight out of a Monet painting.

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

This stone quarry was used to make axes and other tools more than 6,000 years ago.

The haunting concrete remains of a Nazi pebble crusher can still be found in this small French commune.

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

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

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

View one man's eccentric collection of nearly 5,000 corkscrews, then sip some Chablis.

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

Today this former Nazi concentration camp stands as a poignant memorial to the victims of fascism, and a warning from history.

The remains of this castle, known as the Witch’s Eye, watch over the Thur Valley.

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

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.

Miles of man-made caves and tunnels are currently used for cultivating mushrooms.

A massively oversized measuring tape sculpture sits inside a hidden yard.

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.