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Ancient history researcher Cassie Coppersmith (‪@CassieCoppersmith‬ ) joins Matt Beall to explore some of the world's most mysterious megalithic sites - from Cambodia and India to Easter Island and Peru. Together they examine lost engineering, massive ancient water systems, precision stonework, unexplained pyramids, and the evidence that some of these sites may predate the civilizations traditionally credited with building them.

Cassie shares why Cambodia has become one of the most overlooked ancient mysteries on Earth, what LIDAR is revealing beneath the jungle, and why she believes some of these remarkable structures point to a forgotten chapter of human history.

Is our understanding of the ancient world missing something fundamental?

Multi-ton, precision fitted megalithic structures in Perus Sacred Valley show cataclysmic levels of destruction, evidence that these ancient places pre-date the Inca and likely have an origin in Pre-Younger Dryas history, before our own history began.

Investigating the Osirion at Abydos using Lidar and GPR analysis to verify the 1902 records of Flinders Petrie and Margaret Murray. Is this megalithic structure a New Kingdom cenotaph, or a Pre-Dynastic temple older than the Great Pyramid?

This episode of The First Explorers dives into the discovery & explorations of Egypt's strangest, most mysterious buried site. Analyzing the word-for-word accounts of the Osirion's first explorers to see how they interpreted the Cyclopean masonry and the bizarre subterranean layout that defies traditional Egyptian timelines.

Hidden deep in Cambodia's jungle lies Koh Ker – an ancient megalithic city added to UNESCO in 2023 that's 7X bigger than Angkor Wat! Discover the massive solid stone 7-tier pyramid (Asia's tallest), colossal multi-ton lingas, a 7km dam creating Cambodia’s largest ancient reservoir, bizarre black-burned temples, a megalithic sanctuary and alignments linking this mysterious site to India.

Is Koh Ker WAY older than experts claim? View evidence in 4K that archaeologists do not want you to see!

In Part 1: Tour Prasat Thom, climb the solid-stone pyramid, explore the colossal lingas, uncover the unexplainable black burn marks, walk through a megalithic graveyard and question the dating.

00:00 Intro to Koh Ker 02:15 Site Overview & Alignments 05:30 Prasat Thom Gateway 08:45 Epic Sculptures 12:20 The 7-Tier Pyramid 16:10 Giant Lingas Revealed 20:45 Black Patina Mystery 24:30 Bedrock Carvings 27:15 Dating Evidence Debate 30:00

Ross Coulthart is on assignment in Egypt reporting on the culture's ancient mysteries in a special three-part series for NewsNation's "Reality Check."

In Episode 3, Coulthart visits historic sites along the Nile River, including The Great Pyramid of Giza, the Sphinx, the Valley of the Kings, the Egyptian Museum in Cairo and other treasure-filled areas.

From classical antiquity comes legends and stories of an Ancient Egyptian site so large and complex that it is said to exceed all the works of the ancient world, including the majestic pyramids of Egypt! Long since thought lost, this place has, in modern times, been confirmed to exist, with numerous scans using a variety of modern technology, including the new space-based deep earth scan methods.

Despite the efforts of numerous groups to discover more, the history of work done at this place has been suppressed, yet it could yet represent the greatest discovery in our modern age, it's quite a story.

The ancient ruins of Baalbek in modern-day Lebanon might be the most compelling evidence of an advanced ancient civilization missing from our history books. This monumental complex, with its immense megalithic stones, some weighing over a thousand tons, defies any explanation through the lens of conventional archaeology.

Graham Hancock a journalist and author who for over 30 years has explored the controversial possibility that there existed a lost civilization during the last Ice Age, and that it was destroyed in a global cataclysm some 12,000 years ago. He is the presenter of the Netflix documentary series "Ancient Apocalypse", the 2nd season of which has just been released.

The Osirion is an ancient temple found in Egypt, at Abydos. It is situated at a lower depth than the structures nearby. It features a very different architectural approach, and is frequently flooded with water which would have made carving it impossible had the water level been the same at the time of construction.

Exploring the ancient Serapeum of Saqqara in Egypt with the Brothers of the Serpent! A discussion of Ben van Kerkwyk's raw footage of a visit to the ancient and enigmatic set of underground tunnels and alcoves that house 24 massive, precision carved granite boxes. Each box, and lid, is carved as a single piece from the same block of stone. Some weigh a combined 100 tons, and all are housed in a bedrock tunnel system beneath the sands of Saqqara - a famous necropolis of Old Kingdom Ancient Egypt.