Every year, millions of people park their suitcases or put on backpacks and flock to visit the seven continents of the wold. They wander through the castles and museums of Europe, and the cities and natural wonders of North and South America. Some visit the vast exotic cultures of Asia,Africa, and the Middle East.The great outback of Australia is a wonderland for those who go there. And a few lucky people even make to the most mysterious continent on the earth-Antarctia