Several walls were built as early as the 7th century bc, these walls were later joined together and made bigger and stronger, this is what we call The Great Wall of China. The wall mesures 5,500.3 miles in length. There are many activities that can be done when visiting the fortification, the main one would be hiking. While hiking, not only are you able to observe the architecture, but you also have an amazing view of thr ground beneath you.