Undoubtedly one of the greatest man-made wonders of the world, the Great Wall of China was built over the course of 2,000 years. It stretches approximately 5,500 miles, across deserts and over mountain passes, through plains and across plateaus.

The 'Great Wall' is actually the combination of several different walls, which have been built up and reinforced on many occasions. Several of the walls were built as early as the 7th century BC, but the walls built and reinforced by Qin Shi Huang, first Emperor of China, are the most famous and celebrated.