The technology to build large stone monuments has been repeatedly rediscovered. Once you have stone chisels, a quarry, and a log supply, plus enough food to ma

The technology to build large stone monuments has been repeatedly rediscovered. Once you have stone chisels, a quarry, and a log supply, plus enough food to maintain a population of people to work the stone and haul it, and a stable leadership, you can rebuild these in a few hundred years.