2. Windsor Castle, Berkshire
Constructed during the 11th century, Windsor Castle is the largest and longest occupied castle in the world. This illustrious palace is synonymous with the British royal family and has been since the time of Henry I. It’s an official residence of Her Majesty The Queen, and according to reports, it’s her favorite weekend retreat. It’s often used for ceremonial and official State occasions. Situated on thirteen acres, various tours allow you to see the State Apartments, St. George’s Chapel and Queen Mary’s dolls’ house. If you don’t catch the changing of the guards ceremony at Buckingham Palace, you can also see it here.