Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Towering basalt columns, a creation of fire and ice.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

High on a hill overlooking Los Angeles lives a world famous, high-power conical Tesla Coil.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The remnants of a Gilded Age elegance preserved in the middle of a stark modern tower.

Ice cream stand, snack bar, and time capsule of milk conveyance.

This 19th century granite fortification is one of the most well preserved forts in New England.

Protecting the future of some of the rarest and most misunderstood mammals of North America.

Why have you never heard of the second most popular tourist site in New York?

Run by a eugenics advocate, this aging institution conducted secret radiation experiments sponsored by Quaker Oats.

An artifact taken from one of America's shortest wars.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

Explore the dark underground corridors of this graffiti-covered former military fortification.

The world's largest rotating world.

This tiny patch of arid sand sits in one of the greenest states in the United States.

Learn about the history and hopeful future of Maine’s nesting birds at this interactive Audubon facility.

A reliquary of pop culture marvels, including the world's largest (and most terrifying) Jack-in-the-Box.

The oldest platform carousel built in the United States continues to delight children in Martha’s Vineyard.

This mural celebrates the early integration of a New Hampshire baseball team.

Unlike other abandoned asylums this empty institution welcomes visitors, just don't go in the buildings.