"Historic sites" means "historic property," as defined in RSA 227-C:1, VI, namely "any building, structure, object, district, area or site that is significant in the history, architecture, archeology or culture of this state, its communities, or the nation." The term includes "any prehistoric or historic district, site, building, structure, or object included in, or eligible for inclusion in, the National Register of Historic Places maintained by the Secretary of the Interior," pursuant to 36 C.F.R. §800.16(l)(1).
N.H. Admin. Code § Site 102.23