Devizes Castle sits on its original Norman motte at the western edge of the old town, visible from the market square. The structure you see now is a Victorian Gothic mansion built in 1842 on the foundations of the medieval castle, which had fallen into ruin after the Civil War. It is a private residence and not open to the public, but the exterior is visible from the road and the motte gives the building an unmistakably castle-like presence.
The best view of the castle is from Bridewell Street to the north or from the footpath that runs along the western edge of the town. The original Norman castle was one of the most important royal strongholds in medieval Wiltshire, and its history of sieges, royal visitors, and political intrigue is well covered in the Wiltshire Museum. Worth a look as you walk between the market square and St John's Church — both are only a few minutes away on foot.