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Camber Castle is one of thirty Henrician Castles built by Henry VIII between 1539 and 1540 as an artillery fortress to counter the threat of invasion from Catholic France and Spain.

The castle lies between Rye and Winchelsea in East Sussex. Camber itself is actually 2.5 miles away, to the other side of Rye.

The castle was built around an earlier tower that had been built adjacent the sea to defend the harbour. The sea has since retreated by 1 mile.

Viewed from above the Castle has a tortoise like shape with four round towers at each corner and another entrance tower. Visitors have to walk for a mile or so get to the castle.

Grade I listed.

Read more at wikipedia Link

The Device Forts, also known as Henrician Castles, are a series of artillery fortifications built to defend the southern coast of England by Henry VIII. After his divorce of Catherine of Aragon England was left politically isolated, and a treaty between France and Spain in 1538 aroused fears of invasion.

The buildings all followed a similar form, with squat towers.

Wikipedia Link

In the United Kingdom, a scheduled monument is a 'nationally important' archaeological site or historic building, given protection against unauthorised change.
There are about 20,000 scheduled monuments in England representing about 37,000 heritage assets. Of the tens of thousands of scheduled monuments in the UK, most are inconspicuous archaeological sites, but some are large ruins.
Wikipedia: Link