A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A giant Troll lurks under one of Seattle's oldest bridges.

Not a single witness can attest to the creation of the world's largest geoglyph.

A gigantic collection of teeny, tiny books.

Enormous statue of the Emperor of the Mongols.

Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.

A sculpture of a giant hand reaches for the stars in the middle of the Atacama desert.

A 32-acre fun park dedicated to all things cheese.

This hidden sculpture garden full of Wild West art is one of San Antonio's best-kept secrets.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

The site of the climactic scene from the classic horror film is now a historic landmark.

Peruse rare tomes like poetry bound in pearls or books with branches and berries growing out of their spines.

Mysterious meeting place for UFO hunters near Area 51.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

A sacred mountaintop temple offers a fine cup of tea to visitors who can survive the journey.

Rippling sand dunes frozen in the Arizona rock.

A gargantuan crystal kingdom.

A dilapidated dock tells the story of Titanic's missed arrival.

This isolated airport in the middle of the Everglades sees more alligators than planes.

A black and white solution to the Bolivian city's traffic problems.

The unedited photograph called "Bliss" has graced the screens of over a billion computers.

An otherwise quiet campground becomes a bustling medieval town for two weeks every year.

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.