One of the most compelling arguments for the Ancient Astronaut theory is the remarkable engineering evident in the construction of ancient megalithic sites worldwide. Even with the most advanced machinery available today, replicating these ancient wonders would be a daunting task. The colossal stones, precise cuts, and perfectly fitted blocks at many of these sites hint at the fascinating prospect of advanced technology. Join experts Giorgio Tsoukalos, William Henry, and Jason Martell as they embark on a global investigation, revisiting the series archives of "Ancient Aliens" to explore the most enigmatic archaeological sites, including Giza, Puma Punku, Nan Madol, Baalbek, and others.

Compelling evidence of ancient flying machines is found in cultures across the globe. The Saqqara Bird, an artifact from ancient Egypt on display at the Cairo Museum, strikingly resembles modern aircraft. Ancient Sanskrit texts describe vimanas--intricate flying machines of the gods--in remarkable detail, while early biblical accounts contain similar technical references to the "chariots of the gods." Ancient Astronaut theorists Giorgio Tsoukalos, William Henry, and Jason Martell delve into the series archives of "Ancient Aliens" to reveal the most compelling evidence of ancient flying machines and explore the possibility that these extraterrestrial close encounters have persisted throughout the ages.

Are we truly alone in the Universe? Ancient Astronaut theorists propose that descriptions of sky gods and star beings might reflect real encounters with extraterrestrial visitors in the remote past. Could this be true? Follow experts Giorgio Tsoukalos, William Henry, and Jason Martell as they sift through the series archives of "Ancient Aliens" to uncover in-depth descriptions and portrayals of these entities from Egyptian, Sumerian, Chinese, Mesoamerican, and Native American traditions. Could the evidence reveal these beings to be... ancient astronauts?

Based solely on Charles Darwin's Theory of Evolution, the rapid development of modern humans seems impossible without a 'missing link.' Could this link involve extraterrestrial intervention? Join Giorgio Tsoukalos, William Henry, and Jason Martell as they delve into the series archives of "Ancient Aliens" to uncover compelling clues about mankind's true origins. Discover evidence within religious texts, records from Earth's first civilizations, unexplained anomalies in human physiology, and clues embedded within our very own DNA. Could extraterrestrials have really guided human evolution? And if so, does the experiment with the human genome persist even today?

Beneath the surface of China lies the Longyou Grottoes, a breathtaking subterranean marvel featuring grand staircases, expansive hallways, and colossal ten-story columns carved from rock--believed to be over 15,000 years old. This remarkable discovery mirrors Derinkuyu, an enigmatic underground city found in Turkey. Meanwhile, in the American Southwest, secret tunnels linked to Native American lore of the Ant and Snake People are rumored to house covert government UFO programs. And in Egypt and Ecuador, libraries from a lost civilization have long been speculated to be concealed in underground caverns. Might these locations, and others, validate ancient legends of underground realms inhabited by extraterrestrial beings? And if so, what other otherworldly secrets might lie beneath our feet?

Throughout history, legendary weaponry and advanced technologies have often been attributed to divine or extraterrestrial influences. Japanese swords were believed to be forged with the help of the supernatural, while mythical weapons granted by otherworldly beings were wielded by iconic figures like Joan of Arc and King Arthur. The enigmatic Greek fire, whose origins remain a mystery to historians, is yet another weapon attributed to these so-called-gods. And as humanity developed nuclear capabilities, references in ancient Vedic scriptures to weapons of similar destructive power raise profound questions about our past. Even more intriguing is the evidence suggesting the existence of intelligent defense systems seemingly protecting Earth. Could all of these weapons have originated from... an alien arsenal?