Congress establishes the National Underground Railroad Network to Freedom program to preserve and document Underground Railroad sites. Since its founding, the program has identified over 700 sites.
The National Park Service Network To Freedom (NTF) consists of sites, locations with a verifiable connection to the Underground Railroad; programs, with educational and interpretive programming that pertain to the Underground Railroad; and facilities, either research, educational or interpretive centers. There are currently over 700 locations as part of the network in 39 states, plus Washington DC and the US Virgin Islands.
[This post is still under construction, more forthcoming in 2023]