The World's Largest Castle is a Parking Garage - Apparently.
The Royal Garage in Warsaw, Poland, measures 18,500 square meters in area, surpassing the largest castle by area, the Prague Castle. Built in 1909 as a garage for the Polish royal family's cars, it now houses a museum and event space. The structure's grandeur and ornate details, including a grand staircase and ornate chandeliers, make it a surprising example of a castle repurposed as a parking garage.