Dover Western Heights
Dover, United Kingdom · built 1779
The Western Heights of Dover is a series of forts and ditches in Dover, England. They were created in the 18th and 19th centuries to augment the existing defences and protect the key port of Dover from both seaward and landward attack. In the early 20th century, the Dover Western Heights was collectively reputed to be the "strongest and most elaborate" fortification in the country. The Army withdrew from the Heights in 1956–61. They are now a local nature reserve.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).