The Dewees Museum, located at 301 W. Main Street in Trappe, serves as the Headquarters of  The Historical Society.

The building, constructed around 1740-1750, was a tavern for many years and served as a stagecoach stop, a polling place, a local court, and was the scene of local rallies for presidential campaigns.

Ongoing exhibits are maintained throughout the year. Special exhibits are offered that emphasize the heritage of the area, often with lectures that provide insight and depth.