During WWII, the secret interrogation site P.O. Box 1142 housed high-ranking German scientists, including rocket engineer Wernher von Braun.
The facility served as a base for the U.S. Army's 'MIS-X' program, which helped captured Allied soldiers escape from enemy prison camps.
Concrete batteries built in the late 1890s, such as Battery Mount Vernon, were designed to protect Washington D.C. from potential naval attacks.
The park land was once part of George Washington’s Mount Vernon estate, specifically his River Farm property.
The interrogation site was so secret during the war that its existence was not declassified by the U.S. government until the late 20th century.
Fort Hunt Park is a former coastal defense fortification and World War II intelligence interrogation center located on the banks of the Potomac River. The site was originally established as part of the Harbor Defenses of Washington during the Spanish-American War. During World War II, it operated under the codename P.O. Box 1142, serving as a secret facility for interrogating high-value German prisoners of war. Today, the park is managed by the National Park Service as part of the George Washington Memorial Parkway. The landscape features remnants of historic gun batteries and concrete emplacements nestled within wooded areas. Visitors can access multiple picnic pavilions, open fields, and walking paths. The park serves as a hub for local outdoor recreation, including field sports and birdwatching. Informational signage throughout the site details the various eras of its military utility. It remains a quiet space that preserves a unique intersection of military history and public recreational land.
The moss-covered, graffiti-etched concrete walls of the historic mortar batteries.
Bring a printed copy of the self-guided history walking tour map, as cell reception can be spotty near the batteries.
Utilize the picnic pavilions early in the day as they are available on a first-come, first-served basis unless reserved.
Wear closed-toe shoes if planning to explore the wooded paths near the old battery structures.
Do not attempt to enter sealed or restricted-off military bunkers for safety reasons.
Park grounds are generally accessible year-round; however, specific picnic pavilions may be closed for winter maintenance or reserved for private events.
Maintain silence near historical monuments; follow all 'Leave No Trace' principles; do not climb on the aged concrete battery structures.
