Please answer the following question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Kelsborrow Castle - Kelsborrow Castle is an Iron Age hill fort. Hill forts were fortified hill-top settlements constructed across Britain during the Iron Age. It is one of only seven hill forts in the county of Cheshire in northern England and was probably in use for only a short time. In the 19th century a bronze palstave was recovered from the site. It is protected as a Scheduled Ancient Monument.
A:
Building