4. The Great Barrier Reef, Australia
The Great Barrier Reef is one of the Seven Wonders of the World and with good reason. Australia’s Great Barrier Reef is the largest living structure at 1,680 miles in length and is even visible from Earth’s orbit. Exploring this living masterpiece by sailing, snorkeling and diving is a must do. With more than 400 kinds of colorful coral, as well as sponges, sting rays, dolphins and more than 1,500 species of tropical fish, over 200 types of birds and around 20 different types of reptiles like sea turtles it is simply stunning. Simply put, a trip to the Great Barrier Reef is like nothing else on earth.