Environmental Element archeologist, points out various recent renovations in brickwork to the Matthew Jones House during the Archaeology open house at Joint Base Langley-Eustis, Va., Oct. 19, 2016. The house serves as an architectural museum, displaying artifacts found on Mulberry Island, the land Fort Eustis, Va. is built on.(U.S. Air Force photo by Staff Sgt. Teresa J. Cleveland)

Christopher McDaid, 733rd Civil Engineer Squadron Environmental Element archeologist, gives a tour of the Matthew Jones House during the Archaeology open house at Joint Base Langley-Eustis, Va., Oct. 19, 2016. The home came into federal possession March 15, 1918, when the U.S. Army purchased Mulberry Island, Va. and the surrounding land for $538,000 from Edward Milstead to establish Camp Abraham Eustis, Va., named after the first commanding general of nearby Fort Monroe, Va. (U.S. Air Force photo by Staff Sgt. Teresa J. Cleveland)

Christopher McDaid, 733rd Civil Engineer Squadron Environmental Element archeologist, shows guests a map of Mulberry Island during the Archaeology open house at Joint Base Langley-Eustis, Va., Oct. 19, 2016. The oldest building on the installation is available for group tours upon request throughout the year. (U.S. Air Force photo by Staff Sgt. Teresa J. Cleveland)

Christopher McDaid, 733rd Civil Engineer Squadron Environmental Element archeologist, explains the history of artifacts on display at the Matthew Jones House during the Archaeology open house at Joint Base Langley-Eustis, Va., Oct. 19, 2016. Built in 1700, the house is the oldest building owned by the Department of Defense in the United States. (U.S. Air Force photo by Staff Sgt. Teresa J. Cleveland)