From 1850-1855, 625 South Delhi Street was the home of William Still, the prominent abolitionist and leader in the vigilance movement who has become known as the Father of the Underground Railroad, and his wife, Letitia who worked as a seamstress. In 1850, the year the Fugitive Slave Act became law, William Still became a Chairman within the Pennsylvania Anti-Slavery Society and stepped up efforts to aid fugitives from slavery. Here, he and his wife aided and sheltered hundreds of people fleeing slavery, including Harriet Tubman. Photo source: Phillyhistory.org.