Tibet, the Roof of the World, is the highest region on Earth, with an average elevation of 4,900 meters. Located in a plateau north of the Himalayas, it is a mysterious, exotic place for many outsiders. Since the beginning of the 20th century, the massive, tranquil land with its majestic scenery and mysterious religious culture has exerted an awesome draw on travelers. [China.org.cn/By Chen Baojian]