Cleveland is one of the largest cities in the state of Ohio and is bathed by the waters of Lake Erie. There are plenty of landmarks dating back to the early 20th century, when the city was a major industrial center, such as the William G. Mather steamboat (now part of the Great Lakes Science Museum). It is also famous for its stately Museum of Art, the Cleveland Orchestra and the Rock and Roll Hall of Fame, designed by I. M. Pei.