Conisbrough Castle in South Yorkshire stands on a limestone spur about 175 feet (53 m) above the River Don. William de Warenne built the earlier castle, and Hamelin Plantagenet rebuilt it in stone around 1180 to 1190. The article names no architect, and the infobox gives no style.
The keep is described as late Norman and unique in England, with a hexagonal plan, six buttresses and four floors. It is 62 feet (19 m) in diameter and 92 feet (28 m) tall, with walls up to 15 feet (4.6 m) thick, in magnesian limestone. The infobox gives a height of 62 feet, which looks like the diameter.
Subsidence in the 16th century collapsed gates and walls. Keep floors and roof were reinstalled from 1993 to 1995, and a £1.1 million renovation with a new visitor centre followed in 2013. The ruin is Grade I listed and open to the public.
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