The Castle can be visited
Chester Castle

In the English city of Chester is Chester Castle, a historic site that once housed a medieval castle. Today, only a few remnants of the complex remain, including parts of the curtain wall and the Agricola Tower.
History+
The origins of Chester Castle date back to the 10th century, when a Saxon fortification stood on this site. Following the Norman Conquest of England, Hugh d’Avranches, the first Earl of Chester, had a motte built around 1069/70. The castle served as a base for further conquest and secured the bridge over the River Dee. In the 12th century, the wooden tower was replaced by the stone Flag Tower.
Source: Wikipedia · Licence: CC BY-SA 4.0
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 53.1852, -2.8928