A one-ton statue of Steve Rogers beautifies the entry to a Brooklyn Bed, Bath & Beyond.

The world's oldest hologram gallery and the labyrinthine laser laboratory of a holography pioneer.

A crumbling hospital from the 1850s on Roosevelt Island.

One of the largest Marian shrines on the West Coast stands rather unexpectedly in Silicon Valley.

A deserted hodgepodge of experimental structures designed by nearby university students.

San Francisco Bay's ghost town.

This airfield played a key role in both World War II and the Cold War.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

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

The headquarters of a secretive order is also a beautifully-designed park.

At night, this glittering musical tunnel draws skaters and photographers.

The largest permanent Monopoly board makes one of the longest games even bigger.

An extensive collection of ancient Egyptian artifacts and mummies.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

Ten 25-foot-tall, beehive-shaped kilns, abandoned in Death Valley.

Abandoned anti-ballistic missile base.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

A Bicycle Path in the Sky.

A decommissioned Naval base now rents itself out for people who want to blow stuff up.

A hospital closed seemingly in the middle of operations, leaving behind fodder for horror films and ghost hunters.

This mountaintop beacon is only lit three times a year but shines like some kind of all-seeing eye.

Once a place of peaceful repose, this sanitarium now faces an uncertain future.

A long-vacant Scottish Rite temple in Hollywood has been converted into an art museum filled with Masonic relics.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.