The curious minds at What If reveal the top three coolest space megastructures, imagining the mind-blowing engineering feats that could exist beyond Earth.

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. For centuries, humans have harnessed ...

This programme unveils the engineering secrets of six iconic megastructures that went on to spark a technological revolution, ultimately changing warfare forever. The Nazis built some of the biggest ...