I will start.
1: A massive nation called Tartary existed in the recent past that employed advanced archaic technology such as wireless energy transfer. Tesla had some knowledge of their teachings.
2: The Jews know about regular cataclysm's that happen ~ every 150 - 300 years when the poles flip. They constantly rewrite history to blame plagues, droughts, wars, etc. This information is also classified and is the main reason the buildings you see in America from ~1850 and older are always half buried, or just google "mudflood" for brainlets.
unredacted version from a masonic library (CIA redacted half this book)
https://anonfiles (Dooot) com/9bFcs1Ebo2/Chan_Thomas_-_The_Adam_And_Eve_Story_UNCENSORED_pdf
3: Jews know how to make flying carpets and other flying machines. Much like the Vatican archives Jews also hoard such information, The field of study for a Jew is called Merkabah mysticism. Normally this school of Jewery is reserved only for the elite. We can infer some of the contents from the Hebrew Ben Sherira chronicle. Ben Sherira describes magic carpet manufacture as acquiring clay from a very high mountain creek. This diamagnetic clay is then processed by mixing with Grecian oil and super heating the mixture to activate and separate the super diamagnetic material before processing it into a dye for the carpet.
As for larger flying machines less is known, it is believed they took the tech from India when the East India Company sacked the country. Very few Sanskrit texts describing vimana manufacture survive in India to this day. What is left is mostly flight manuals that sparsely describe the inner workings. Heating of mercury to set it in motion is a constant theme however.
4: Free Masons are Jew cucks who help dig up ancient cities and patch them up so we can pass them off at worlds fairs. They also hide any ancient tech these buildings incorporated such as metal domes and resonant structures.