National Historic Landmark-Philadelphia City Hall

Designed by John McArthur, Jr. (1823-1890), this is the largest and most elaborate City Hall in America that is still in use.

It is also the world's tallest bearing-wall construction laid up without a steel skeleton.

Alexander Milne Calder and assistants carved the hundreds of sculptures that adorn the building, including the 37 foot bronze figure of William Penn that tops the central tower.

Courtesy National Park Service National Historical Landmarks