Ch 15: "Ground Markings, Insignia and High Rise Markings" (made with Spreaker)

Source:
https://www.spreaker.com/user/zerobrain/ch-15-ground-markings-insignia-and-high-

Mysterious markings and symbols have been discovered on the moon.  What are they? Natural formations? An unknown alien language? Or could it be evidence of mankind's ancient and highly advanced past???