The Imperial Palace of Roman Emperor Diocletian in Split, Croatia's second largest city, is enormous. It sits right along the seaside promenade, and its outside walls are 590' by 705' in dimension. It dates back to 300 AD when Emperor Diocletian was in residence. Inside the walls is an entire city composed of both ancient ruins and more modern structures. Churches, shops, apartments, restaurants, etc., can now all be found within its walls.