January 1, 2014, 11am PST
Many of America's national treasures sit in low lying areas of D.C. that are vulnerable to extreme floods (it was built atop a tidal plain, after all). With such floods likely to increase, planners and engineers are devising protection plans.
February 17, 2013, 9am PST
As the destructive force of Hurricane Sandy demonstrated, all sand dunes are not created equal. But as coastal communities start to rebuild their defenses for the next storm, they're trying to close the gap with Mother Nature.