Ancient Aliens is counting down ten of the most intriguing–and mysterious–symbols and codes found across the globe that just might contain proof of otherworldly contact. From glyphs in the Peruvian desert, to spiral petroglyphs embedded with advanced math, and a language with an otherworldly origin, could these codes unlock the secrets of our extraterrestrial past?

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Deep beneath the sands of Egypt lie 24 enormous sarcophagi–and every one of them is empty. What purpose might these giant tombs have served? And is it possible that the perfectly carved stone boxes–each weighing more than 70 tons–were designed not by humans… but by otherworldly visitors?

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Throughout the world there are mysterious ancient stones shaped into perfect spheres. Many of them show clear evidence of being manmade and some completely defy explanation. Could the mystery of the stone spheres provide clues about humankind’s alien past?

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