If you've ever wondered how they built Stonehenge, how they shifted Easter Island's Moai statues into place or how many workers it took to construct the pyramids, then this list of the most awe-inspiring ancient feats of engineering is for you. The following entries are all marvels of extraordinary technical prowess and innovation, and required a staggering amount of manual labour.

From youngest to oldest, read on for the most remarkable feats of engineering ever achieved in the ancient world...