Visitors watch water gushing from the Xiaolangdi Reservoir into the Yellow River, during a sand-washing operation in Jiyuan, Henan. Water is discharged at cubic metres per second in order to clean up sediment.
The world famous Machu Picchu found in Peru. Machu Picchu was built as an estate for the Inca emperor Pachacuti. Often referred to as the "Lost City of the Incas", it is perhaps the most familiar icon of Inca civilization.