Beneath a colonial-era church in the Mexican state of Puebla sits a structure that dwarfs the Great Pyramid of Giza by nearly ...

Throughout history, humanity has demonstrated an insatiable desire to build bigger, reach higher, and create structures that seem to defy the laws of physics ...

Longtime readers may remember a proposal to recreate the experience of standing on the the Moon inside a giant spherical structure here on Earth. That concept never materialized, but now, four years ...