Given the question: Castle of Loule - Castle of Loule (Portuguese: Castelo de Loule) is a castle in the municipality of Loule in the Portuguese Algarve. Classified a National Monument since 20 June 1924 three towers remain within the cordon of walls the remnants of the alcaldaria located within the structure. 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