In today’s History newsletter: Archaeologists have uncovered what was below Hitler’s war lair, the 30-foot sea cow whose tasty meat and trusting nature doomed it, and an intriguing theory for Amelia Earhart’s disappearance.

But first: How did the Egyptians build the pyramids? Scholars have a new theory and we have a very cool interactive explaining it! 

Giza's Great Pyramid is comprised of over two million stone blocks, some weighing more than 50 tons. But how did they get there? A new hypothesis is gaining traction, thanks to recent discoveries—including a hidden diary and a lost river. Our interactive experience is the most definitive explanation yet of how we believe the pyramids were built.

Thanks for reading today’s newsletter, edited and curated by Sidney Madden and produced by Rita Spinks. Sign up here to get our future adventures in your inbox.