Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

Scattered throughout London are ancient remnants of the city's former bounding wall.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Famously misunderstood wonder of the ancient world

Its dark depths conceal millions of rare, delicate crystal formations.

Each summer, the migratory bats living beneath the bypass form "batnadoes" at dusk.

The remains of a deserted steamboat sit rusting beside an old ferry pier and an abandoned train platform.

An abandoned car and strange wooden debris are among the scattered remains of the old sand and gravel quarry.

This one has sailed five times as far as Sir Francis Drake's famous ship.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

Rusty pieces of metal jutting out of a breakwater are all that's visible of the 12,500-ton ocean liner that capsized just off the beach.

A hard-to-reach oasis in a desolate corner of Death Valley National Park.

A massive hydrovolcanic explosion left a half-mile wide crater in Death Valley.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

Salt is slowly eating away this abandoned saltworks town in the desert.

This abandoned boat was left in place thanks to its rotting beauty.

Frank Lloyd Wright died a year before construction on his largest public project even began.

Inky sludge oozes to the surface of this beach thanks to a rare natural tar seep.

Crumbling pink walls and murder memorials preserve the pioneer history of Joshua Tree.

A B-17 bomber stands as a memorial to the residents of Tulare County who served in World War II.

Few other hotels can rival the grandeur of the Castle in the Rockies.