Betchworth Castle in Surrey UK. Built in the 11th century to be used as an earthwork fortress and turned into a stone castle in 1379, later rebuilt in the 15th, then 18th centuries (see first image below). However, after being bought by a new owner in 1834, much of the masonry was removed for work elsewhere, with the Castle being allowed to collapse to create a picturesque ruin. To be honest, I’m surprised anything of the building remains.
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