The eccentric mansion of one the most popular horror authors of modern times.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

A ring of creosote bushes that are estimated to be 11,700 years old.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

An architectural oddity hides in plain sight on this iconic London bridge.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

Eyam took steps to quarantine themselves and keep the plague from spreading.

This park is home to California's first oil boomtown, with structures that have stood for more than a century.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

Two Civil War-era cemeteries stuck between runways at the world's busiest airport.

This amazing 15th-century mural remained hidden in plain sight for centuries.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

Spend the night in this formerly abandoned traditional Scottish village.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

Etched into a dry lake bed, this massive directional indicator is accurate without magnets.

Dozens of lights dangle from the branches of what may be the brightest tree in Los Angeles.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

Colin Stokes "got a bit carried away" and built a castle that looks like something out of Tolkien.