Just imagine what we could accomplish if we were able to mobilize a massive number of people in this age. A 21st century equivalent of the pyramids or the grea

Just imagine what we could accomplish if we were able to mobilize a massive number of people in this age. A 21st century equivalent of the pyramids or the great wall of China. What will our descendants look at and say "I can't believe they built this 2000 years ago!"?