The ruins of the castle that chemicals built.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

World War II-era Nazi compound nestled in the Santa Monica hills.

Gift shop offering toe tags and chalk body beach towels tucked into a coroner's office.

The last of its kind in the country.

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

Medical and zoological curiosities for sale.

A fire lookout atop a glacial pinnacle is reached by climbing three vertiginous flights of stairs.

Traversing these canyons, visitors can take in stunning views and glimpses of the region's history.

A train tunnel that was made obsolete by the dam it helped create.

Hidden inside this Arizona fast food franchise is an in-depth exhibit on the famed WWII counterintelligence program.

This reclusive Hopi village in Arizona has been continuously populated longer than anywhere else in America.

More than 300 years ago, a revolt at this Hopi pueblo shaped the future of the American Southwest.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

This rustic cabin, outfitted with gun slits, was once home to John D. Tewksbury, patriarch of the bloodiest family feud in American history.

A mysterious "wedding cake" castle in the middle of the urban desert.

Once the product of an inexplicable gold strike, this ghost town is now home to one man and his love of classic machines.

An Arizona museum with a collection of pharmaceutical oddities, including a jar of a gangster's chewed gum.

An artificial crater field that trained astronauts for lunar exploration.

Don't blink or you'll miss it.

This golf ball–shaped former desert real estate office now houses a UFO museum.

Miniature art that tells an enormous story.

In this small Phoenix taxidermy emporium, you can find everything from a squid in a jar to a freeze-dried toad.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.