Papakōlea Beach isn't your typical beach. Commonly referred to as "Green Sand Beach," the stretch of shoreline on the Island of Hawaii (the Big Island) is said to be one of only four green-sand beaches in the world. It's also the only one located in the 50 U.S. states. To reach the others, you'll need to book flights to Norway, Guam (a U.S. island territory in Micronesia), and the Galapagos Islands.