Given the question: Water Wall and Pine Streets Lenticular Truss Bridges - Water Wall and Pine Streets Lenticular Truss Bridges is a national historic district and set of Lenticular truss bridges located at Homer in Cortland County New York. The district includes a series of three bridges built in 1881 over the Tioughnioga River by the Corrugated Metal Co. of East Berlin Connecticut.It was listed on the National Register of Historic Places in 1977. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
The answer is:
Building