I recommend the topics of, Inner Earth, Kingdom of Tartaria.

Interesting perspective.

Yes. There's plenty of buildings built pre 1900 that have been covered and built upon. Some with the door moved up a few stories and the everything under it buried. What remains is repurposed. Hidden from our new generation. There's buildings or structures under 20 plus feet of earth being found. Our existence isn't that old. They wiped every remenant of our past in the 1800s. Lots of fake history was made to cover it up too.

The way everything's going, it's going to happen again. With our government and their descendents still in control.