The longest man made structure of the 5 billion years old planet earth, the feeling you get on top of it can not explain by worlds!!!!!! This shows a amazing sign of great history, culture and civilization which is over 2400 years old. I walk over 5 kilometers on top of the wall in stunning sunlight with great difficulty to get a complete view of the wall. Finally succeeded through a small window, I could capture this. Thanks god, the weather was perfect, so it came our pretty cool !!!