After flooding in the past two weeks, the city of Minot, North Dakota, is still largely underwater, but an ambitious plan is unfolding to protect it the next time. See interactive satellite images.
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Before and after: A controversial flood plan put to use
The town of Cairo, Ill., was saved last week when Army engineers opened a levee to divert surging floodwaters as part of a controversial plan first authorized in 1928.

Before and after: Tuscaloosa in the tornadoes’ path
The tornadoes that tore across the south last week left a devastating trail of loss and destruction. Comparative satellite images provide a vivid portrait of what was lost.