The remains of the Iron Age hill fort can be visited
Badbury Rings

In eastern Dorset, the Badbury Rings are the remains of an Iron Age hillfort.
History+
The origins of the Badbury Rings date back to approximately 800 BC. The site was actively used until the Roman invasion of England around 43 AD. The roughly seven-hectare fort was once surrounded by three timber ramparts, each about 15 meters high. Evidence of an even earlier significance of the site is provided by four Bronze Age barrows. On one of these barrows, rare carvings can be found, depicting daggers, axe-shaped triangles, and cup-and-ring marks, similar to those at Stonehenge. Historians suggest that Badbury Rings was a strategically important point, possibly even the site of the Battle of Mons Badonicus, and could have been an inspiration for the Arthurian legend.
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: 50.8265, -2.0522