russell cave national monument is a u.s. national monument in northeastern alabama, united states, close to the town of bridgeport. the monument was established on may 11, 1961, when 310 acres (1.3 km) of land were donated by the national geographic society to the american people. it is now administered and maintained by the national park service. the national monument was listed on the national register of historic places on october 15, 1966.