1. Buck Island

Buck Island Reef National Monument – St. Croix, U.S. Virgin Islands

“The reef surrounding was named America’s first-ever underwater national monument in 1961 which, naturally, has resulted in an ecosystem so thriving and well-preserved that 30,000 visitors a year flock to see it, making it the single most popular attraction on St. Croix. This was the highlight of our vacation!”

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