Discover the world's longest residential buildings, from historical marvels like Corviale House and Karl-Marx-Hof to the ...

Across the world, archaeologists keep stumbling on structures so old, so large and so technically sophisticated that they ...

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 ...

Although human constructions have modified natural spaces for millennia, few plans or maps predate the period of the literate civilizations of Mesopotamia and Ancient Egypt. Researchers from the ...

A team of Italian scientists took the world by storm last March when they announced the discovery of a colossal underground complex plunging nearly 3,500 feet beneath Egypt's Giza Plateau and linking ...