A unique underground structure dating back to the 1st century BC.

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

The famous winding walk at Chartres is surrounded in mystery and myth.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

Indents in the pavement are all that remain from a grisly death machine in Paris.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

France's most famous cemetery, with some of its most curious tombs.

The rocks in this arid basin leave trails of movement behind them.

Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

"Only the devil could play golf here."

The liveliest ghost town in the state.

An off-grid art installation that encourages its visitors to imagine a world without waste.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

A hand-built folk art installation covered with messages of God's love.

A ruined hotel with an unlucky history and an eerie present.

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

A sparse, solitary sequoia still stands as a living tribute to the famous conservationist who planted it—but it's dying.

This subtle Berkeley paving stone actually marks off a lawless tube of air that extends into space.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

A music-filled, booze-soaked oasis in the desert.

A fake town founded by Western movie stars is now becoming a hip desert community.

The decaying adobe remains of an old homestead are just off the beaten path in Joshua Tree National Park.