MNN - Mother Nature Network

For people who are willing to don an air tank and wet suit, the marine world is one of the last places where it is truly possible to appreciate nature in a setting where nature still rules. The coasts of the U.S. mainland have an abundance of sea-life-filled diving destinations, while Caribbean territories and the U.S. islands of the South Pacific give America a full menu of marine diving spots that will bring excitement to even the most experienced divers. Want to experience some world-class diving without having to dig out your passport? These destinations are your best options.