In this Echoes of old Earth, we found the old world order we take a look at what seems to be the same style of buildings from 30 countries all over the world. By about the 5 or 6 min mark in this video the point should become clear. There is a missing epoch of history that was happening less than 200 years ago. So what happened to all those people?

https://www.youtube.com/watch?v=ABAhrX7e-q0