Great point!
Yes, those world fairs, Tartarians, orphan trains, mudflood... TONS of rabbit holes we need to research.
Awhile back, I had seen somewhere some talk about SASER's. Like a light-based laser, these tools were using high frequency sound (SASER vs LASER) to cut right through marble, granite, you name it. Megaliths could have been freeformed with some form of plasma ("melting" the stone) so that it could be easily shaped and molded.
Looking at the stones at Machu Picchu, it becomes clear that no amount of humans could have done that with just "primitive" tools as they teach us. Our ancestors clearly had technology that has been hidden from us today, and/or destroyed.
It's all about control. Our minds, energy, money, food..
Some of the stones are so intricately carved too, it really is jaw dropping indeed:
RE: 20 Proofs NASA Faked the Moon Landings