The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

An eclectic trailer park retreat in the middle of the California desert.

Collection of vintage trailers double as hotel rooms.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

Home to items never before seen by the public.

It was once the base for a series of domestic terror attacks.

There’s a hidden military meme engraved on the World War II Memorial.

A historic neighborhood church is reborn as a psychedelic arts collective.

A working cattle ranch with remarkably well-preserved prehistoric petroglyphs and ancient ruins.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

This Route 66 classic sports a giant fiberglass rabbit that you can ride.

A motel dedicated to Southwestern nostalgia.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.

The last slot car racing arcade in Brooklyn is keeping the dream of speedy little autos alive.

Neon signs that grace the windows of Bergdorf Goodman's and Tiffany & Co. come from this studio in Brooklyn.

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

A curious friendship between two inanimate ladies.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

Tucked in the back of this amazing antique store is an important piece of medical history.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.