Mount Hua in China is well known as one of the oldest schools of martial arts and mentioned in many books, dating back 700 years. For most of its time the narrow plank path has been covered by nomads, travellers, monks and many other without any harness.
Stretching 7000 ft into the sky it is a terrifying path with epic views. Today visitors are required to use a harness, but as you can see some folks like Mark Laurence think it is not needed and walk part of the narrow trek without the safety harness. This is insane and scary stuff!