The 5 coolest abandoned military installations in America

abandoned bases fort jefferson nps
Fort Jefferson in the Dry Tortugas National Park. (National Park Service)

When you think of abandoned military installations, American bases probably don’t come to mind. How’d you like a hike up Machu Picchu or a stroll at Angkor Wat? From the Aztecs to the Assyrians, fallen civilizations leave some incredible ruins behind, don’t they? But what about us Americans—us rascally rascals, with our patriotic stars and stripes?

Okay, America is indeed an active civilization. But you might not know that we already have a ton of abandoned monuments. Here’s a list of the five coolest abandoned military installations in the country.

1. Nekoma Pyramid, North Dakota

Stanley R. Mickelsen Safeguard Complex, Missile Site Control Building, Northeast of Tactical Road; southeast of Tactical Road South, Nekoma. (U.S. Air Force)
Stanley R. Mickelsen Safeguard Complex, Missile Site Control Building. (U.S. Air Force)

Move over, Giza. America has its own pyramid, and it just so happens to be entirely abandoned. The Stanley R. Mickelsen Safeguard Complex (also known as the North Dakota Pyramid) was built to protect our country against missiles flown over the North Pole. It’s too bad the site didn’t last long. The military pulled the plug on it shortly after construction was completed. Though its halls are vacant, it’s still a grim reminder of America’s Cold War era. And yes, the command center is built inside an actual pyramid.

2. Fort Jefferson, Florida

An aerial view of Fort Jefferson in the 1940s. (National Archives)
An aerial view of Fort Jefferson in the 1940s. (National Archives)

In 1825, America was a baby nation, but it was getting bigger. With its territories stretching from Maine to Florida, it had quite a lot of coastline to look after. Fort Jefferson, just outside Key West, was one of the largest forts built along the East Coast and is the largest brick masonry structure in the Western Hemisphere, composed of more than 16 million bricks. It was abandoned in the 1860s, but you can still ferry to it and have a look. If you head to Florida to check out this abandoned installation, check out the old cisterns that held fresh rainwater for the Army to drink.

3. Fort Pike, New Orleans

fort pike abandoned military installations
Cracks are visible in the brickwork of Fort Pike after Hurricane Katrina. Cracks can be seen in the brick structure of Fort Pike after Hurricane Katrina.

The War of 1812 left America more than annoyed with the United Kingdom. The U.S. had become a powerhouse in North America, but British ships still trolled the Gulf of Mexico trying to do us in. Then, along came Fort Pike off the coast of mainland Louisiana. The military base protected trade ships coming into New Orleans Harbor. These days, it’s pretty well abandoned but you might be able to see some of the foundations that still remain.

4. Fort Tilden, New York

abandoned bases fort tilden queens
Fort Tilden in New York City’s Queens borough.

This abandoned installation is the only base on our list to have served in three wars (applaud here). It was built during World War I to protect NYC. Then, during World War II, it housed some of the military’s biggest guns. Finally, during the Cold War, the military fitted it with Nike air missiles just in case the Russians got out of line. Luckily, the Cold War ended, but since then, the place has become overgrown with vines. In fact, it’s a national recreational area these days that you can visit.

5. North Concord Air Force Station, Vermont

Abandoned bases North Concord Air Force Station
(Chad Abramovich/Obscure Vermont)

Rounding out our list, this abandoned site has a radar tower sitting atop the scenic East Mountain. Why did we need a radar tower on the East Coast in the 1950s? If you guessed Russia, you’re going home with a prize. America kept its eyes to the skies back then, making sure the Soviets didn’t end civilization with their nukes. Lucky for us, they never tried anything, and we were able to abandon this mountainside tower.

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Jessica Evans

Senior Contributor

Jessica Evans has more than a decade of content writing experience and a heart for military stories. Her work focuses on unearthing long-forgotten stories and illuminating unsung heroes. She is a member of the Editorial Freelance Association and volunteers her time with Veterans Writing Project, where she mentors military-connected writers.


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