The document discusses WikiProject:NRHP, which aims to document properties listed on the National Register of Historic Places (NRHP) on Wikipedia. It lists NRHP sites in tables and writes articles about individual sites. Volunteers take photos of NRHP sites and answer questions. County NRHP lists provide names, addresses, and coordinates of listed properties in a county and note which need photos. Tips are provided on taking good photos of historic sites and finding more information about listed properties.