2. Warwick Castle
Another of the English castles built by William the Conqueror (he was a busy boy protecting the country he had invaded), Warwick sits on the River Avon in the Midlands. It was a symbol of the power of one of the mightiest dynasties in England (Earl of Warwick), right up until the 1970s when it was purchased by the Tussauds Group and opened as a tourist site and museum. It is one of the few castles that comes close to the size and cost of Windsor Castle and is a Grade I listed building and Scheduled Ancient Monument.