Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

Eclectic collection of dark and macabre antiques.

One of the oldest reform schools in the United States, home to wayward boys such as Merle Haggard, now abandoned.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

A mining town once rife with murderous disputes over its copious treasures now creates income as a popular spot for photo shoots.

Most-visited and most-photographed slot canyon in the American Southwest.

The world's largest military aircraft cemetery.

Miniature art that tells an enormous story.

Successful artist residence program has filled this ranch with dozens of sculptures over the years.

The haunting ruins of Jack London's dream house.

A ruined hotel with an unlucky history and an eerie present.

San Francisco Bay's ghost town.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

Join the circus for a few lessons to learn clowning, acrobatics, and Chinese contortion.

Radioactivity still cause for concern at this urban explorer's paradise.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A man-made island in scenic San Francisco Bay.

Antiques by the Bay.

A playground built by the kids that is a child's wonderland, and a helicopter parent's nightmare.

A store that sells all manner of bones, insects, and animal curiosities.

A storybook European village in Berkeley.

Where a staggering 747 ships were constructed during World War II.

Spiral labyrinth hidden in the hills above Oakland, CA.