The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

Beyond being incredibly fun, not much can be said about the Hole with certitude.

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

Giftshop catering to cryptozoologists and anyone with a sense of humor.

A hospital closed seemingly in the middle of operations, leaving behind fodder for horror films and ghost hunters.

Stroll through a wonderland of stupendous moss-covered trees.

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

Elevated freight railway turned wildly successful urban park.

The first declared National Monument in the United States.

One man's homage to the sun continues to grow like a glass fractal.

America's most famous piece of self-built architecture.

A giant Troll lurks under one of Seattle's oldest bridges.

Mysterious rocks that ring musically when struck.

Medical and zoological curiosities for sale.

A layered tribute to the work of mosaicist Isaiah Zagar.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

A strange house built only at night, with rumored mystic inspiration.

Enormous lake at the bottom of a unique cave system.

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

A 140-year-old castle with underground caves hidden in San Francisco.

Towering basalt columns, a creation of fire and ice.

Eighteen miniature death-scene dioramas.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.