Answer the following question: The Southern Terminal Susquehanna and Tidewater Canal is a national historic district at Havre de Grace Harford County Maryland United States. Located along the western bank of the Susquehanna River near its mouth at the Chesapeake Bay it includes the Lock Master's House the canal's outlet lock and the foundations of a bulkhead wharf along the river side of the lock. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
Answer:
Building