Great Barrier Reef

The globe's largest coral reef system – and one of the original Seven Natural Wonders of the World – touts incredible scenery. At Australia's Great Barrier Reef, you'll find more than 600 islands and 1,500-plus species of fish. Though plenty of diving and snorkeling spots can be found along Queensland's coast, to escape the crowds, visit the Whitsunday Islands. Also, save time for viewing the reef from above during a flightseeing excursion.