The Castle can be visited
Launceston Castle

In Cornwall, England, stands Launceston Castle, the ruin of a Norman fortress that once belonged to the Earls of Cornwall.
History+
The origins of Launceston Castle date back to the Norman period, when it served as a fortress for the Earls of Cornwall. The castle also housed the town's prison. During World War II, a hospital found refuge within its walls. The southern gatehouse, in the Middle Ages, led into the Earl's private deer park. It was secured with heavy doors and a portcullis and accessible via a fortified bridge over a moat. An apartment was located above the gate.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Colin Jackson
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: 50.6376, -4.3614