Portland Castle
Dorset, England
Portland Castle is a castle in Dorset, England, first built in 1539. It is a scheduled monument. The nearest other castle is Sandsfoot Castle, 2.0 mi away. It is cared for by English Heritage.

Portland Castle at a glance
Built
1539
16th century
Type
Castle
Cared for by
English Heritage
Heritage status
scheduled monument
Grade I listed building
About Portland Castle
Portland Castle is an artillery fort constructed by Henry VIII on the Isle of Portland, Dorset, between 1539 and 1541. It formed part of the King's Device programme to protect against invasion from France and the Holy Roman Empire, and defended the Portland Roads anchorage.
From the Wikipedia article on Portland Castle, CC BY-SA 4.0.
Portland Castle sits at 50.5684, -2.4468 in Dorset. The closest other castles are Sandsfoot Castle (2.0 mi), Pennsylvania Castle (2.2 mi) and Rufus Castle (2.2 mi). Dorset has 13 castles in all.