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. Denbigh Castle - Denbigh Castle (Welsh: Castell Dinbych) was a fortress built following the 13th-century conquest of Wales by Edward I.The castle which stands on a rocky promontory above the Welsh market town of Denbigh Denbighshire was built upon an earlier Welsh stronghold. It was defended by a unique triple-towered gateway.A planned town (bastide) was laid out at the same time as the castle. The Anglo-Norman borough was an attempt by Edward I to pacify the Welsh.
A:
Building