Night sky over the Great Wall of China. Astronomers (lower centre) photographing the night sky from a section of the Great Wall of China. The Great Wall of China was built in stages between the 5th and 17th centuries, from materials such as earth, or stone and brick. The longest section is over 6000 kilometres long, and is the longest man-made structure in the world. It was declared a UNESCO World Heritage Site in 1987. Photographed on 3 January 2017. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / JEFF DAI |
Bildgröße: | 5472 px × 3648 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |