The Rossborough Inn is a historic building facing Baltimore Avenue/United States Route 1 (also formerly known as the old Washington Boulevard and the Washington and Baltimore Turnpike) on the eastern edge of the campus of the University of Maryland at College Park. Construction on the building began in 1798 and was completed in 1812, making it the oldest building on campus (older than the 1856 university itself) and the oldest building in the adjoining town of the City of College Park. It is built in the Federal style. The lower wings were added in 1938, as part of extensive renovations. The Rossborough Inn is listed as a historic site by the Maryland-National Capital Park and Planning Commission.