This episode explores structures around the world that appear to mirror constellations when viewed from above, arguing they may have been designed as messages for—or by—extraterrestrial visitors. The most extensively featured example is the Glastonbury Zodiac in Somerset, England, a pattern of landscape features allegedly depicting all twelve zodiac signs across miles of terrain. Artist Katharine Maltwood first identified these shapes in 1927 aerial photographs, claiming rivers, roads, hills, and field boundaries form recognizable figures including a lion for Leo and twin fish for Pisces. Ancient astronaut theorists like those featured suggest that because these patterns are only visible from the air, ancient peoples without flight capabilities must have received guidance from beings with aerial technology. The episode highlights features like Ponter's Ball, a mile-long earthwork positioned precisely where Capricorn's horn would be, and Glastonbury Tor, a terraced hill some researchers believe conceals a pyramid and predates Celtic civilization.
Mainstream archaeology remains deeply skeptical of the Glastonbury Zodiac, noting that humans excel at pattern recognition and can perceive meaningful shapes in random landscape features—a phenomenon called pareidolia. Most scholars attribute the terrain's configuration to natural geological processes, medieval agricultural boundaries, and Norman-era land management rather than deliberate ancient design. The zodiac interpretation has been challenged since Maltwood's original publication, with critics pointing out that the "figures" require significant imagination to recognize and don't align precisely with astronomical positions. Still, the episode raises genuinely intriguing questions about why ancient cultures worldwide invested enormous resources in constructing enormous geoglyphs like Peru's Nazca Lines, which similarly reveal their full form only from above, long before human flight became possible.
Alatri Acropolis
Italy · Ancient Greek/Roman
Theorists, including Giorgio Tsoukalos and archaeoastronomer Dr. Giulio Magli, argue the Alatri acropolis was intentionally shaped to mirror the constellation Gemini when viewed from above, possibly commemorating an extraterrestrial visitation, with its massive stones suggesting non-human involvement in construction. Mainstream archaeologists attribute it to pre-Roman Italic peoples and consider it the finest megalithic construction in Italy, though its precise origins remain debated.
Doggerland (North Sea)
United Kingdom · Neolithic British
Theorists argue Doggerland is the real-world location of Atlantis — a technologically advanced civilization that coexisted with extraterrestrials and was destroyed by catastrophic flooding, with its survivors fleeing to the British Isles and creating structures like the Glastonbury Zodiac. Mainstream archaeologists identify Doggerland as a habitable landmass that was submerged by rising sea levels approximately 8,000 years ago following the last ice age.
Grand Central Terminal
United States · Modern
Theorists argue that Grand Central Terminal's enormous zodiac wheel mural depicts the precession of the equinoxes and encodes extraterrestrial knowledge about humanity's past and future, including the transition into the Age of Aquarius. The mural is a well-documented architectural feature of the terminal, painted on the ceiling of the Main Concourse and based on a medieval manuscript depicting the winter sky.