Reality Check - Part 1

"This series of articles is dedicated to all those brave people who care more about the truth than their bad reputation as conspiracy theorists. Those who still believe in the children's story that 9/11 was an attack by Islamic terrorists will find it difficult, if not impossible, to come to terms with the contents presented here. Indeed, they require the courage and will to think the impossible - that the lie has not been in the world since 2001, but much longer."
Chapter 1: Buried Cities
Where did the floor on Leipzig's city hall go? Was there a mud flood around 200 years ago? If yes, why is this not known?
Chapter 2: The so-called Gilded Age
Was there really a Gilded Age starting in 1870? Or are these buildings much older? Nothing is as it seems.
Chapter 3: Strange fires, then and now
Why does Chicago after the 1871 fire look like California today or after 9/11? And why weren't the buildings made of wood, as we're told?
Chapter 4: The mystery of the vanished world's fairs
Where did all the World's Fairs go, who built them in such a short time? Why did they all burn down, and by what kind of fire?
Sources, image descriptions and references from the original article:
https://www.thomasliebl.de/begrabene-staedte-1/
(searched and found by Flo, DieZuversicht)