New York City Slavery and Underground Railroad Tour. Follow the New York City Freedom Trail and learn how a group of brave men and women forged the network that became the Underground Railroad on this guided, 2.5-hour walking tour. See the site of Fort Amsterdam, the first settlement in colonial Manhattan. Visit the African Burial Ground National Monument, a memorial dedicated to enslaved Africans in colonial America. View the former New York City stations that were included on the Underground Railroad and discover how New Yorkers risked their lives to help people escaping slavery. Book and Save 15%! New York City Slavery and Underground Railroad Tour.