An underwater city for the dead.

A cemetery and the town it served sinks beneath the sea during the volcanic birth of Mt. Vulcan.

An ancient city exhumed from the depths of the ocean.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

This ultra-modern home clings to the slope of the Hollywood Hills on a precarious stilt.

A century-old shot ball factory tower is open to the public once a year.

This museum/fur store is devoted to educating guests on how awful opossums can be.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

Stay in a room with a view... of the bottom of the ocean.

This crumbling stump is all that remains of what was once thought to be the oldest living organism.

The remains of a sunken military ship wreck visible through clear water.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

Swarms of dainty flying insects swarm into the Petaloudes Valley to get busy.

Quite simply the largest tree in the world (by volume).

These millipedes glow not out of attraction, but as a not-too-subtle warning.

Get up close to emus and ostriches, or buy their tasty meat.

One of the last taxidermists in New York City.

This cave was hidden for thousands of years, storing the worldly goods of ancient Native Americans.

The hundreds of movies and television shows shot in this high desert town are commemorated in a unique museum.