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

The Roman Fort of Brocolitia, also known by the names Procolita or Brocolita, was a Roman military outpost on Hadrian's Wall in Northumberland, England. It was the northernmost point of the Wall.
History+
Brocolitia Fort was constructed after Hadrian's Wall and even spanned the vallum, a ditch accompanying the Wall. Its northern boundary was either the Wall itself or a parallel fortification. Archaeological findings, including 48 inscriptions, confirm the stationing of various Roman units. These included the First Cohort of Aquitani, the First Cohort of Tungri, the Cohors I Cugernorum, as well as the First Cohort of Batavians and the First Cohort of Frisiavones. In the late 19th century, archaeologist John Clayton uncovered a military bathhouse and a corner tower during excavations. A Mithraeum from the early 3rd century, a nymphaeum, and the well of the goddess Coventina were also discovered near the fort.
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: 55.0348, -2.2219