The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

This wondrous waterfall rushing down a green-covered mountain wasn't discovered until 2010.

At 929 pounds and 26 feet tall, this stainless steel fork can only be used by the likes of King Kong.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

Finding the exact middle of a giant land mass is hard to determine, but this spot managed to do the trick.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

The bells remain in a shattered heap exactly as they fell when the church was bombed in World War II.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

This rare volcano spews the strangest and (literally) coolest lava in the world.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

South Africa's postal service began with a letter left in a boot beneath this tree.

An impressive display of ships and artifacts from the ancient Mediterranean maritime trade.

The colony of South Australia was proclaimed on a hot December day under a distinctively arched gum tree.

A huge musical instrument played by the ocean.

A volcanic old faithful, Stromboli has been erupting continuously for the last 2000 years.

6000-year-old site covered in more than 50 megaliths.

A modern zoetrope on the New York City subway.

A fiery crater has been burning in the Karakum Desert since 1971.

A geological bull's-eye visible from outer space.

A spectacular cave and a beguiling lake.

The fairy tale castle of the "fairy-tale king."