The British royal family's Windsor Castle measures 484,000 square feet and has around 1,000 rooms. It often hosts world leaders for state visits, including President Donald Trump during his UK visit.

And many still standing now offer nightly accommodations. Windsor Castle is the largest castle in England. It also holds the distinction of being the oldest and largest occupied castle in the world.

President Donald Trump and first lady Melania Trump got the royal treatment as they began their historic second state visit to Britain on Sept. 17, complete with a carriage procession in ornate black ...