Given the question: Chateau de La Coste (Lot) - The Chateau de La Coste is a ruined castle in the commune of Grezels in the Lot departement of France.The castle exhibits military architecture of the 14th and 15th centuries. It was restored at the end of the 16th century after it was ruined in 1580 during its capture by Protestant troops. Originally a simple watch tower the square plan castle is flanked by two massive square towers in the west and two round towers in the east. 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