Humans have long been obsessed with building big, and as the world strives to combat climate change, megastructures may hold the key to a more sustainable future.

What if Giza’s history is older than the pyramids themselves? In this on-site investigation, we explore rough-cut “boat pits” ...

Far below the waves off the coast of Brittany, France, divers have mapped a massive stone barrier that should not exist, at least not according to the standard story of early European prehistory.