This vast fortified and moated tower was built for Ralph Cromwell, Lord Treasurer of England from 1433 to 1443. The building was restored by Lord Curzon between 1911 and 1914 and contains four great chambers with enormous Gothic fireplaces, tapestries and brick vaulting. There are spectacular views across the Fens from the battlements and a guardhouse with museum room. What’s new in 2004: Events to celebrate 90th anniversary of castle first being open to the public