Thirlwall Castle
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Thirlwall Castle is a 12th century castle in Northumberland, England, close to the village of Greenhead and approximately 20 miles (32 km) west of Hexham. It was built in the 12th century, and later strengthened using stones from nearby Hadrian's Wall, but fell into disrepair in the 17th century.
In 1999 the Northumberland National Park Authority took over the management of the castle, protecting it from further dereliction.
The site is protected by Grade I listed building and Scheduled Ancient Monument status.