 The Historic Old Central High School, built in 1892 of locally quarried sandstone at a cost of $460,000, it houses an 1890s classroom museum.It features a clock tower with chimes patterned after Big Ben in London; the clock faces are each in diameter, overlooking the Duluth harbor.The Aerial Lift Bridge, spanning the Duluth Ship Canal into Duluth's harbor, is a vertical lift bridge.