This ramshackle ghost town is comprised of mining-era buildings collected from around the region.

A lawless town deep in Death Valley was famous for its riches and death rate.

A ghost town originally established and governed solely by Black Americans seeking a place of their own, free from discrimination.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

This enormous sinkhole hides a secret world created from divine wrath.

Buried beneath the New Mexico sands are believed to be millions of copies of Atari's E.T. video game.

Granny Smiths and Fujis can both be traced back to Kazakhstan, where apples still grow wild.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

A mysterious monument covered in a binary code marks the heart of tech.

Florence’s mother built a stairway down to her daughter’s coffin so she could comfort her during storms.

Like a kitschy mirage in the Mojave, this eatery serves up classic 50s-style diner meals and a dinosaur sculpture garden.

The cluster of boulders near Fort Irwin is covered in military insignia.

A desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

The set location for a 1987 cult classic draws international film buffs to the middle of the Mojave Desert.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

An acoustic anomaly with a mysterious cause.

The original place where water met land in the City by the Bay is outlined in brass.

The blinking light atop the iconic landmark has been sending secret messages for decades.

Double spiral staircases are not unheard of, but they are very rare.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

It was an experiment to prove that glacial boulders and rocks can be used in constructions and dwelling.