There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The United States Capitol's former columns still stand.

The largest wine cellar in the world is a 150-mile network of underground caves near the capital of Moldova.

This sign marks the entrance to a tiny proto-state within the small country of Moldova.

On this romantic tidal island reachable only at low tide the tomb of a famous French writer overlooks the sea.

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

Small French town or alien garage?

This church sits upon a peaceful hill and a long, turbulent history.

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

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

For a brief time in 1960s France, families could climb into a tiny submarine and be pulled along an underwater journey.

A small town hallucinates en masse - Bad bread, or CIA science project?

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

Tens of thousands of ancient rock carvings hidden in the heart of a French national park.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

The Sun King's military models, saved from the Louvre.

The world's tallest bridge is also possibly the most elegant.

A French valley with forests so lush it was nicknamed "the Small Amazonia of the Pyrenees."

The world's largest reflecting pool is just two centimeters deep.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

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

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.