Please answer the following question: Sharon Valley Historic District - The Sharon Valley Historic District is located around the junction of Kings Hill Sharon Valley and Sharon Station roads in Sharon Connecticut United States. It is a small community that grew up around an iron mining and refining operation during the late 19th century the first industry in Sharon.Many of the buildings within date from that era. Some are intact examples of their respective architectural styles. There are remains of the original industrial facilities and three iron bridges. 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?
A:
Building