Watch The Secret of Skinwalker Ranch | History Vault 6 SEASONS AVAILABLE (98 Episodes)Did this fierce fighting machine with its superior weapons, advanced tactics and blood lust finally turn on its master and ultimately assist in toppling the Roman Empire? Watch it free for 7 days. Commercial-Free. Cancel Anytime. Start free trial to watch Browse episodes × HISTORY Channel brings you thousands of documentaries and series exploring the events and people that shaped our world, from ancient empires to modern warfare. Stream now commercial-free. Cancel anytime. Start free trial to watch History Vault Brings You Thousands of Documentaries & Series Learn more Available on: