Sign 1 of the National Underground Railroad markers at the Calvert Street entrance to Walter Pierce Park, Washington, DC

Sign 2 of the National Underground Railroad markers at the Calvert Street entrance to Walter Pierce Park, Washington, DC

Sign 3 of the National Underground Railroad markers at the Calvert Street entrance to Walter Pierce Park, Washington, DC

Sign 4 of the National Underground Railroad markers at the Calvert Street entrance to Walter Pierce Park, Washington, DC