Family photos of 1915 San Francisco World’s Fair. Buildings Mysteriously disappeared

What if San Francisco was a Tartarian Imperial city with more than 10 royal palaces, artificial islands and a strategic port facing Eurasia and connecting the Americas? If their elaborate buildings were much more than 500 years old and the sophisticated technology would contradict the story of the "foundation of the city in 1776" and all the Official History fairytale - and so it had to be mercilessly burned and erased?