York City Sightseeing Dennis Trident (4011, T409 SMV) at the stop next to Clifford's Tower, part of the site of a Norman castle originally built in 1068.
in 1190, a violent anti-Jewish incident in York was quickly followed by most of the Jewish community there seeking protection within the castle which was then attacked by a mob. Rather than fall into the hands of the attackers, many of the Jews committed suicide and set the keep (then made of wood) afire. The survivors emerged the following day, only to be massacred by the mob.
In the latter half of the thirteenth century, the keep was rebuilt in stone. It was given a quatrefoil plan, of which there is no other example in England. The keep later became known as Clifford's Tower after Roger de Clifford, who was hanged there in 1322. By the 20th century the ruin of Clifford's Tower had become a well-known tourist destination and national monument. Today, the site is owned by English Heritage and open to the public.
The tower is a Grade I listed building (English Heritage Building ID: 462999
Link British Listed Buildings).