went to see some rock tombs, and I thought to myself, how did people even manage to build that? Not only it's HUGE, but it's built on steep mountains, and they carved the tomb out of the rocks! Now I see why @DarthCoin wants to build something that LAST; really, most of us probably live around 100 years, and once gone, it's gone; then you get to see people build something from thousand years ago and still stands, like how did they even plan things out without pen or paper, or any sophisticated tools? And all the later generations come all the way to see and admire their creations.

The second thought is the more I see, the more I think people in the past mastered way better skills than the modern ones, yes you built airplanes, the internet, and many cool techs, but the knowledge of how to live in harmony with nature or how to make the most of natural material is going downhill.