Hidden behind a gate in Greenwich Village is a little farmhouse that once served as the writing studio of a bestselling author.

Denmark’s never-ending bridge.

In the loving memory of a tragically deceased role-player this Illinois park is decked out with both dungeons and dragons.

A collection of colorful dinosaurs hidden in an actual rainforest.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This innocent-looking townhome is actually a subway exit.

A quiet and contemplative oasis in the middle of New York's bustle and riot.

A floating cat sanctuary on an Amsterdam canal.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

Exact replica of the ancient monument, but much, much lighter.

The beloved, war-tested mascot of a Union regiment graces their battlefield monument.

The U.S. Air Force has an anti-satellite laser weapon.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

Buried beneath the New Mexico sands are believed to be millions of copies of Atari's E.T. video game.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

Once a dining hall for boarding school students, this lodge was a popular haunt for nuclear physicists working on the Manhattan Project.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

The shattered remnants of a meteor that struck Santa Fe more than a billion years ago.

The most powerful laboratory radiation source in the world pulses with 1,000 times the electricity of a lightning bolt.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

This precariously perched fortress was once ruled by a crow-worshipping baron.

The fictional star of "Breaking Bad" is memorialized with a real-life gravestone in his hometown.

A decaying garage hidden amid the dense forest is all that remains of a once-prosperous dairy farm.