The remains of the roman Castle can be visited
Roman Fort Vindoland

The Roman Fort of Vindolanda, a Roman military camp whose remains are now found near Bardon Mill in Northumberland, England, served to secure and monitor the hinterland of Hadrian's Wall, especially the Stanegate road. The site gained recognition through the discovery of over a thousand wooden writing tablets, which provide insights into Roman life on the northernmost frontier of the empire.
History+
The earliest written records of the ruins date back to William Camden in 1586. In the 18th century, preserved parts of buildings were documented before initial excavations began in 1814 under Anthony Hedley. An altar found in 1914 revealed the Roman name of the settlement. In the 1930s, Eric Birley led excavations, which were interrupted by the war. From 1970, the independent Vindolanda Trust took over the site, and under Robin Birley, Eric Birley's son, regular excavations commenced. The damp soil conditions preserved thousands of finds, including the writing tablets.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Ozymandias
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: 54.9912, -2.3602