The city of Lancaster was home to several important figures in American history. Wheatland, the estate of James Buchanan, the fifteenth President of the United States, is one of Lancaster's most popular attractions. Thaddeus Stevens, considered among the most powerful members of the United States House of Representatives, lived in Lancaster as an attorney. Stevens gained notoriety as a Radical Republican and for his abolitionism. The Fulton Opera House in the city was named for Lancaster native Robert Fulton, who had designed the modern steamboat. 