The Jefferson Market Courthouse, an architectural gem constructed in 1876 by Calvert Vaux and Frederick Withers, stands as a testament to Venetian Gothic design. With its intricate tower and belfry, clock, and stunning details like leaded glass and steep roofs, it once ranked as one of America's most beautiful buildings. This photo is from 1905.
It currently is used as a branch of the New York Public Library. You can find out more about its history here.