Visitors to Fallingwater, one of the architect Frank Lloyd Wright's best-known works, listen to tour guides as they stand on the concrete terraces in Big Run, Pa., on Aug. 23, 2007. (Associated Press) **FILE**
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Visitors to Fallingwater, one of the architect Frank Lloyd Wright's best-known works, listen to tour guides as they stand on the concrete terraces in Big Run, Pa., on Aug. 23, 2007. (Associated Press) **FILE**
