Across the world, archaeologists keep stumbling on structures so old, so large and so technically sophisticated that they seem to have no right to exist in the eras that produced them. From submerged ...

A group of researchers have identified at least seven stars that might be surrounded by advanced alien mega-structures known as "dyson spheres." NBC News' Ellison Barber speaks with Janna Levin, a ...

Discover the world's longest residential buildings, from historical marvels like Corviale House and Karl-Marx-Hof to the record-breaking Lutsk building. Explore how these structures shape urban ...