Dover Castle
Kent, England
Dover Castle is a castle in Kent, England, first built in 1179. It is a scheduled monument. The nearest other castle is Walmer Castle, 6.0 mi away. It is cared for by English Heritage.

Dover Castle at a glance
Built
1179
12th century
Type
Castle
Cared for by
English Heritage
Heritage status
scheduled monument
Grade I listed building
About Dover Castle
Dover Castle is a medieval castle in Dover, Kent, England and is Grade I listed. It was founded in the 11th century and has been described as the "Key to England" because of its defensive significance throughout history.
From the Wikipedia article on Dover Castle, CC BY-SA 4.0.
Dover Castle sits at 51.1283, 1.3235 in Kent. The closest other castles are Walmer Castle (6.0 mi), Deal Castle (7.1 mi) and Folkestone Castle (7.3 mi). Kent has 28 castles in all.