Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

The Lone Star plaque hangs in a bombed-out bunker in Normandy to honor a Texan colonel's heroic actions on D-Day.

A luxurious doomsday bunker hidden beneath an unassuming Las Vegas home offers the best of subterranean suburbia.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

A surprisingly beautiful abandoned World War II military base in East Greenland.

At just six feet two inches deep, it is said by Guiness and Ripley to be the world’s narrowest freestanding office building.

This huge repository of local history housed in an old J.C.Penney's is home to the largest model train set in Southeast Texas.

Stay overnight in the world's most sleekly designed rabbit hole, free of charge.

Built in 1906, this unique building was the first Hindu temple in the United States.

Standing in for the first ship to navigate the Northwest Passage.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

An overlooked memorial honoring the local Washington residents who died in World War I.

Go take a picture with the inventor of the daguerreotype photographic process.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

Overlooked amid the tourist bustle of Florence, this museum is dedicated to the craft of stone inlay.

This bakery sits on the site of the Black Panther Party's first headquarters.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

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

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

This theatre was made famous after Lee Harvey Oswald was captured inside watching a film.

A glacier pocked with ice caves and surrounded by rainforests.

A taste of Egypt on the outskirts of Geelong.

The intriguing artifact can be found in the former Australian prime minister's home.

A microcosm of the whaling industry in a small Australian town.