28. Great Barrier Reef (Australia)
The 2,300-kilometer (1,430-mile) Great Barrier Reef is the largest coral reef system in the world. You can swim, snorkel, dive, and sail on this floating masterpiece. That makes it one of the best places to visit in the world
27. Great Wall (China)
The Great Wall of China, is a massive bulwark built in ancient China, is one of the greatest building projects ever undertaken.
The Great Wall was built to deter invasion and secure the trade in silk roads.