The spire of the Cathedral of the Immaculate Conception has been a notable feature of the Portland skyline since its completion in 1854. In 1859, Ammi B. Young designed the Marine Hospital, the first of three local works by Supervising Architects of the U.S. Treasury Department. Although the city lost to redevelopment its 1867 Greek Revival post office, which was designed by Alfred B. Mullett of white Vermont marble and featured a Corinthian portico, Portland retains his equally monumental 1872 granite Second Empire–Renaissance Revival custom house.