This unlicensed collection of fast-food memorabilia sits on the site of the first ever McDonald's restaurant.

This California tree is the single source of the state's entire orange industry.

A celebration of capitalism in Midtown.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

New York City's smallest piece of private property.

Ride the subways of yesteryear.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A semi-scholarly approach to sex.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

Art and armour fill every inch of this rich kid's Italian villa.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

Not truly a ship nor a building, the Navy's first and last "landship" is now abandoned due to clerical issues.

This San Diego museum, housed in a former Navy training facility, is dedicated to preserving women’s historic achievements.

Swarms of butterflies cannot compare to the awe inspired by the publicly-funded nakedness once displayed in this sunken garden.

An inconspicuous footbridge beloved by San Diego locals.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

The freeway that never was.

An ode to the friendship between four Pacific Rim countries.

The classic Atari game's iconic aliens have invaded downtown San Diego.

Every weekend, people gather here for a brief chance to see their loved ones on the other side of the United States–Mexico border.

A monument to the legacy of the man who created Spongebob Squarepants at the school where his passion for art and marine biology began.

Pasadena’s Stonehenge.