Prince William Forest Park housed the Advanced Special Operations and Communications schools for the Office of Strategic Services.
Catoctin Mountain Park was not only home to the presidential retreat we now know as Camp David but also housed the basic OSS school.
The US Cavalry hunted for John Wilkes Booth and other conspirators after the assassination of President Abraham Lincoln.
During WWII, Fort Hunt was the location of a top-secret military intelligence installation.
Last updated: December 5, 2016