4. Windsor Castle
Queen Elizabeth has a particular connection to Windsor Castle, as it is where she and her younger sister, Margaret, spent much of World War II. There is another important connection between Elizabeth and the property, as both her parents, grandfather, and sister are buried in the castle's chapel.
Now, the queen spends one month a year at Windsor Castle with her husband, Prince Philip. They occasionally head there for weekends, too.
The castle is part of a large estate comprised of houses on which various other royals live. Windsor Castle is said to be the largest in-use castle in the world and sits just one hour west of London.