Are sacred places the product of man's reverence for God or the result of contact with ancient space travelers? Jerusalem's Temple Mount has been called a heavenly gateway.
Islam's shrine at Mecca displays a Black Stone believed to have fallen from heaven. And the temple at Baalbek, Lebanon was built on a massive stone structure resembling a landing pad.
Did man encounter divine beings at these holy places, or might they have met ancient extraterrestrials?