Lost Landmark

摘要

Anointing a structure with the designation "National Historic ' Landmark" usually guarantees that it will be around forever. But not always. Take NASA's Full Scale Wind Tunnel at the Langley Research Center in Virginia. The center finished construction of the 2.2-acre tunnel in 1931.'During World War II, its two 4,000-horsepower wooden fans, capable of producing 120-mph winds, ran around the clock testing full-scale aircraft. After the war, engineers at the National Advisory Committee for Aeronautics (later NASA) tested everything from the Mercury capsule to Boeing's proposed supersonic transport.