This innocuous-looking button may have been used to assassinate a king.

A Very Low Frequency transmitter you can tune in on your PC.

Hundreds of mossy stones engraved with bits of philosophy, literature and random musings.

These seven moai figures are the world's only sanctioned replicas of the Easter Island originals.

"Singing sands" and the world's largest hourglass reside near Japan's Kotogahama beach.

The largest collection of model trains in the world is actually run using full-size locomotive technology.

The birthplace of both the Atomic Age and Godzilla, and the namesake of the bathing suit.

"Not too many people can say they've had a nuclear bomb dropped on them, not too many would want to." — Walter Gregg.

The largest man-made crater in the U.S. marks the spot where we once tested mining with nukes.

The contents of this safe survived a 37-kiloton nuclear bomb.

This traditional home is a rare example of 19th-century Korean architecture.

This 317-ton walkable art installation is an homage to Korea's "City of Steel."

Booksellers and public artworks fill this vibrant promenade along the disused railroad tracks.

Collected from all around Seoul, thousands of secondhand books create this photogenic tunnel.

Rocks that take on the likenesses of several recognizable living entities crowd the Wang dong Rock Quarries.

Known as the birthplace of Korean Buddhism, this temple features an ancient, five-story stone pagoda.

One of only a handful of seaside temples in Korea, this sacred space is home to a legendary healing Buddha statue and a traffic safety prayer pagoda.

A traditional village rooted in the Joseon Dynasty.

This tiny museum immortalizes the birthplace of an iconic Chinese-Korean noodle dish.

Japan and South Korea both lay claim to islands inhabited by one woman.

Its humdrum facade only adds to its electrifying appeal: a rooftop with panoramic views of a shapeshifting metropolis.

Seoul amusement park boasts a Korean-speaking pachyderm.

Some of the freshest vegetables in Seoul are grown in a subway station.

This former coal mine has been turned into a sprawling modern art complex.