Windsor Castle is a royal residence at Windsor in the English county of Berkshire. It is notable for its long association with the English and later British royal family and for its architecture. The original castle was built in the 11th century after the Norman invasion of England by William the Conqueror. *WINDSOR CASTLE is the largest castle in England and still a Royal residence. Famous for the Round Tower and St George's Chapel. Explore Hampton Court Palace and Garden Tudor kitchens. The Triumphs of Caesar. Privy Garden. The Chapel Royal Hampton Court Palace gardens. Costumed guided tours. The Maze. and Great Hall. Hampton Court Palace is a story of two palaces: A Tudor palace magnificently developed by Cardinal Wolsey and later Henry VIII, alongside a Baroque palace built by William III and Mary II.