The Great China Wall photo copyrighted by: Galen R. Frysinger
The Great Wall is the world's longest human-made structure, stretching over approximately 6,400 km (4,000 miles) from Shanhaiguan in the east to Lop Nur in the west, along an arc that roughly delineates the southern edge of Inner Mongolia, but stretches to over 6,700 km (4,160 miles) in total. It is also the largest human-made structure ever built in terms of surface area and mass.
Find more Great Wall images in the 7 Wonders gallery of Photorena.
All pics are under copyright of the photographer