Every World Fair or as they were also called, Expositions, essentially displayed the same mind-blowing gargantuan architecture (including canals and exquisite fountains) apparently constructed for a temporary event. This occurred world wide around the turn of the century. Including Australia! The buildings that weren't "deconstructed" all "burned down" in ensuing decades. Many of the colossal constructions were built with steel and glass. Sydney's Crystal Palace is but one example.

I have worked in construction for decades. We would struggle to achieve such construction with all the heavy machinery and power tools we have today.

These Expositions were not what the offical narrative states. They were left overs from a previous highly advanced civilisation. Almost morbidly displayed for one last hurrah before being destroyed.

There are remnants of it everywhere on every continent (who knows re Antarctica).

Tartaria. My favourite topic. The relatively recent history of Earth is beyond fascinating...