Budget Office Director Peter Orszag (far right) has found a way to turn walking into a competitive sport on Capitol Hill. Here, he walks through the Eisenhower Executive Office Building with Vice President Biden, President Obama and Treasury Secretary Timothy Geithner. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP

The reefs of Cuba's Los Jardines de la Reina are protected from fishermen, pollution and fertilizer runoff. The waters are plentiful with huge fish, sharks, sea turtles and saltwater crocodiles. Courtesy of Noel Lopez hide caption

itoggle caption Courtesy of Noel Lopez