(cokada/iStock/Getty Images) Alien megastructures built to harvest stellar energy or alter the orbits of stars may be physically feasible, according to a new analysis – satisfying both our sci-fi ...

From the longest tunnel of the ancient world to a highway suspended above raging waters, Rome built engineering marvels that still defy belief. Explore three forgotten megaprojects that showcase the ...

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 ...