Philadelphia
The architecture of the city is very diverse. It is both modern and historic. It includes Georgian architecture, Federal-style, Palladian structure, Victorian-style, Greek Revival, Gothic, Italianate Second-Empire Style and International Style. The diverse buildings show the rich history of the city. The Philadelphia Historical Commission was formed in 1955. It preserves historical buildings. The Philadelphia Register of Historic Places includes historic buildings. The tallest building is the Comcast Technology Center. For a long time, City Hall was the tallest building. Notable architects who built in Philadelphia include William Strickland, John Haviland, Thomas U. Walter, Frank Furness, Napoleon Leburn, Julian Abele, Rafael Viñoly, César Pelli, Robert A. M. Stern, Louis Kahn and Robert Venturi.