Please answer the following question: Watsontown River Bridge - Watsontown River Bridge is a historic bridge in Watsontown Northumberland County Pennsylvania and White Deer Township Union County Pennsylvania. It was built in 1927 and consists of nine open spandrel arches with a total length of 1080-foot-long (330 m). It is constructed of concrete and crosses the Susquehanna River.It was listed on the National Register of Historic Places in 1988. 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?
Answer:
Building