The U.S. military dumped millions dollars worth of goods off a beach in Vanuatu, purely to spite the British and French.

Site of the world's largest nuclear explosion.

These red marks, seemingly placed at random, are in fact not.

A 63-foot-tall swinging ball hypnotizes passersby, and proves to any remaining doubters that the Earth is spinning.

This sprawling farm was once a Cold War-era hideaway for the nation's top diplomats.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

The roadway bend where highway painters practice their craft looks like expressionist art.

An 18-mile-long tunnel for sewage waste will soon wind within the bowels of Washington, D.C.

A Cold War atomic camp buried under the ice is now emerging because of global warming.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

A painfully obvious spy house sits right across the street from the Russian Embassy.

A remote horde of architectural treasures fit for Indiana Jones.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

An old train trestle re-imagined as an Egyptian obelisk.

Russia's giant concrete QWERTY keyboard is likely the largest in the world.

This small museum gives visitors a chance to soak up the history of the "sponge capital of the world."

A huge boat-shaped hotel with a blood red pool and other oddities.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

The elevator hidden in a smokestack on Roosevelt's yacht now serves as a monument to the former president.

This Italian dam is covered in salt-hungry goats who manage to scale its almost vertical face.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

The residents at this Yellowstone wildlife park will certify your cooler as "bear-proof."

The Forest Service's surprisingly sophisticated collection of wildfire prevention art features America's most beloved bear.

One thousand trees were planted in Norway to be used to print books a century from now.