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

Resting place of Hollywood's immortals is also site of summer film screenings.

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

A one-of-a-kind collection of a unique medium.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

A psychedelic labyrinth on the San Francisco bay.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

World's largest collection of serial killer artwork and other macabre exhibits.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This sanguine boulevard was named after a deadly cowboy bar fight.

A full-scale sculpture of a mermaid and baby grand piano hidden underwater by David Copperfield.

A collection of oddities including Dr. Kevorkian's suicide device, the Thanatron.

A mental health hospital dating back more than 139 years, now features a museum.

The oldest operating cemetery in Denver is the eternal home of some of the Centennial State's most famous residents.

This museum offers an actual time machine back through Colorado's past.

Possibly the world's only drive-in movie theater with an attached motel.

A collection of fading fantasy tchotchkes lines this dirt road in the Colorado wilderness.

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.