 During the 18th century, the cityscape was dominated by Georgian architecture, including Independence Hall and Christ Church.In the first decades of the 19th century, Federal and Greek Revival architecture were the dominant styles produced by Philadelphia architects such as Benjamin Latrobe, William Strickland, John Haviland, John Notman, Thomas Walter, and Samuel Sloan.Frank Furness is considered Philadelphia's greatest architect of the second half of the 19th century.