7. City inside Mountain山中之城
Picture above is the lost city in Petra, Jordan. Built with a perfect defense against external attacks and sand storms. Very impressive, considering that this city was built in ancient times when the machine is not created yet.
上圖顯示的是約旦失落之城--皮特拉。由于建在山中,這座城市能有效地防御外部襲擊和沙塵暴。想想在當(dāng)時(shí)還沒有機(jī)械的時(shí)期能建成這樣的城市,這是多么的不可思議。