York Castle is a fortified complex in the city of York, England. It consists of a sequence of castles, prisons, law courts, and other buildings, which were built over the last nine centuries on the south side of the River Foss. The now ruined keep of the medieval Norman castle is commonly referred to as Clifford's Tower. Built originally on the orders of William I to dominate the former Viking city of Jórvík, the castle suffered a tumultuous early history before developing into a major fortification with extensive water defenses. After a major explosion in 1684 rendered the remaining military defenses uninhabitable, York Castle continued to be used as a jail and prison until 1929.

The first motte and bailey castle on the site was built in 1068 following the Norman conquest of York. After the destruction of the castle by rebels and a Viking army in 1069, York Castle was rebuilt and reinforced with extensive water defenses, including a moat and an artificial lake. York Castle formed an important royal fortification in the north of England.

In 1190, 150 local Jews were murdered in a pogrom in the timber castle keep; most of them died by suicide in order not to fall into the hands of the mob. Henry III rebuilt the castle in stone in the middle of the 13th century, creating a keep with a unique quatrefoil design, supported by an outer bailey wall and a substantial gatehouse. During the Scottish wars between 1298 and 1338, York Castle was frequently used as the center of royal administration across England, as well as an important military base of operations.
Thanks and credit to Google Earth Studio for this aerial video.