Quiet Zone: 711

Part of a shuttered sawmill that closed in 1960 stands near the banks of the Greenbrier River in Cass, W.Va., inside the quiet zone. The National Radio Astronomy Observatory settled on Pocahontas County and its early-20th century railroad towns in part because there was no industry in the area that posed the threat of creating radio frequency interference.

Part of a shuttered sawmill that closed in 1960 stands near the banks of the Greenbrier River in Cass, W.Va., inside the quiet zone. The National Radio Astronomy Observatory settled on Pocahontas County and its early-20th century railroad towns in part because there was no industry in the area that posed the threat of creating radio frequency interference.