The former United States Customs House (now the Coast Guard Heritage Museum) in Barnstable is located at the eastern end of the village, and across the street from the Unitarian Church (featured previously). The building was constructed in 1855, likely under the supervision of Ammi B. Young, who was acting as the first Supervising Architect of the U.S. Treasury Department. The Seventh Customs District was established by Congress in 1789, and encompassed Barnstable County except Falmouth, and it ranked fourth in revenue among the state’s customs districts. By 1850, 91,102 tons of materials had been reported through the district, so the need for a new customs house was clear. The Customs House is said to have been the first ‘fireproof’ building constructed on Cape Cod, in contrast to the traditional wood-frame and shingled dwellings found there. This district merged with Boston in 1913, and the building became a local Post Office until 1958. It was converted to a museum and named after Donald G. Trayser. It was renamed the Coast Guard Heritage Museum in 2005.