They are national treasures, yet some of the nation's most important waterways are under severe threat from pollution, dams & development. Here are the top 10 at risk.
The National Cherry Blossom Festival commemorates its 100th anniversary this year. The 1912 gift of 3,000 cherry trees from Toyko's mayor to the city of Washington, DC. has helped cultivate a close relationship between the two countries.
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