If you’re ever driven along Interstate 81 in Cumberland County, Pennsylvania, there’s no doubt that you’ve noticed the collection of military tanks and airplanes sitting next to the highway. These vehicles are part of the display at the U.S. Army Heritage Center in Carlisle, one of the state’s most in-depth looks at military history.

The Army Heritage Center is located on the grounds of the United State Military War College and the Carlisle Barracks. The museum opened in 2011 to tell the story of the U.S. Army’s history though the use of displays and interactive elements. The site is also home to what might be the most comprehensive library in the world of Army history.

There are two areas at the Army Heritage Center to visit and both are free to the public. The first is the museum inside the visitor center, and the second is the outdoor displays next to the highway.

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