Millennial tunnels stretch across Europe, leading from Northern Scotland to the Mediterranean Sea! It is unlikely that anyone will deny that these 12,000-year-old underground roads are truly spectacular! According to some experts, this was an ancient way of protecting humans from predators. At that time, these tunnels were used as today’s highways: for safe movement, regardless of war and weather!
Many experts call these tunnels ‘’underground tunnels’’! There is another interesting theory that these tunnels are gates to the netherworld.