Launceston Castle, Cornwall
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This impressive castle was built on a big mound in Launceston as a stronghold shortly after the Norman conquest. The original castle guarded the main route in to Cornwall and became the administrative centre for the Earls of Cornwall. By the middle of the 17th century, the castle was virtually in ruins, apart from the North Gatehouse which was used as a prison until this was moved to Bodmin Jail in 1838.