A glass display case holds the document that ended the Second World War—which one person signed on the wrong line.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

This black shoreline is made up of exploded lava particles.

A model of a galactic embassy is hidden in plain sight along the highway, proposed by a UFO religion to find the aliens that created life on Earth.

This small hut in the middle of a parking lot was once the wooded sanctuary of the 'Hermit of Montrose.'

The final resting place of the world's first nuclear reactor.

A historic and oft-filmed prison stands in a Chicago suburb.

A 400-foot-tall tall map of Chicago makes this once-ignored building stand out.

Climbing this abandoned railway leads to breathtaking vistas of O‘ahu.

A theme park made of glass, from the gleaming books on the shelves to the crystal fish in the mirror lake.

Covering 37 subterranean acres, this Armillaria gallic is a famous fungus with its own festival.

South Korea's largely symbolic, barely used gateway to the North.

A galaxy of glowworms—larvae of a gnat—hides deep in the belly of these caves.