Hidden gems: America's 20 least-visited National Monuments
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15. Buck Island Reef, U.S. Virgin Islands( Bob Downing / MCT )
The only way to get to Buck Island Reef is by boat, which can take as long as 90 minutes. The island has only one footpath, and to get anywhere, you walk or swim. The 176-acre island and surrounding coral reefs, 1 1/2 miles north of St. Croix, are among the few fully marine areas protected by the National Park System. The diverse ecosystem includes brown pelicans, least terns and hawksbill, green and leatherback sea turtles.
Visitors in 2009: 47,341
More info: http://www.nps.gov/buis