A fireman walks amongst the rubble and the smoldering wreckage of the World Trade Center in New York in the wake of the Sept. 11, 2001, attacks. Gary Friedman/AFP/Getty Images hide caption

itoggle caption Gary Friedman/AFP/Getty Images

Mourners attend a memorial service for recent cholera victims in Haiti that took place Wednesday in Savanette, an isolated community in the mountains outside Mirebalais, Haiti. Cate Oswald/Partners in Health hide caption

itoggle caption Cate Oswald/Partners in Health

Doheny Beach in Orange County, Calif. photographed in 2005. A new report on the nation's beaches found that Doheny exceeded at least one water quality standard 42 percent of the time it was tested in 2010. Flickr hide caption

itoggle caption Flickr