Portland Castle
Open to visitorsan English Heritage site — check opening times and admission before you go
Substantial ruinsruined, but plenty survives above ground
Portland Castle is a castle in Dorset. The Albion Guide charts 16 castles in the county; this is one of them. Weymouth Station is 5.3 km away to the north. Sandsfoot Castle and Rufus Castle are among the castles within 3.4 km.
More at the National Heritage List entry