Watch all new episodes of Ancient Aliens returning soon, and stay up to date on all of your favorite History Channel shows at https://history.com/schedule. Northern Italy is a renowned hotspot of UFO activity. Could secret alien bases be hidden throughout the Italian Alps? Ancient Astronaut ...

Watch all new episodes of Ancient Aliens returning soon, and stay up to date on all of your favorite History Channel shows at https://history.com/schedule. Billions of years ago, asteroids hitting Earth deposited metals crucial to technological advancement. Could we find even more of these ...