The remains of Swansea Castle stand on a low rise just above Castle Square, in the middle of the modern city centre. What survives is the south-east block of the medieval castle, with a long arcaded parapet of pointed arches that is unusual for Wales — closer in style to the bishop's palace at St David's.
The interior is not open to the public, but the ruins are floodlit at night and look striking against the modern offices and bars that surround them. A few interpretation panels at street level tell the story of the lordship of Gower and the town's long struggle between Welsh and Anglo-Norman rulers.