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This spine-tingling ruin sprawls among fields and hedges on Kenilworth's outskirts. Built in the 1120s, the castle survived the longest siege in English history in 1266, when the forces of Lord Edward (later Edward I) threw themselves at the moat and battlements for six solid months. The fortress was dramatically extended in Tudor times, but it fell in the English Civil War and its walls were breached and water defences drained. Don't miss the magnificent restored Elizabethan gardens.