No it's really not. Any technologically advanced civilization would have disturbed the earth in ways that would still have shown today (mining, top soil remova

No it's really not. Any technologically advanced civilization would have disturbed the earth in ways that would still have shown today (mining, top soil removal, vast irrigation works etc) as well as used at least some of the natural resources, We'd find strangely high concentrations of materials even if it was spoil. Advanced technologies don't just spring out the ground full formed, you have to bootstrap up the tech tree, something as 'simple' as an iPhone requires vast industrial capabilities backing it from mining and refining the metals, the oils for the plastics, the silicon for the processors, the copper for the traces, each piece of technology is the center of a massive web of interconnected industries and finally people, for advanced technologies you need thousands/tens of thousands of specialists in every single part of the production chain. As for your Pyramids thing, https://en.wikipedia.org/wiki/11th_century_in_architecture https://en.wikipedia.org/wiki/11th_century_in_architecture ... yes? The pyramids while wonders of the world required nothing we'd remotely consider advanced technology to build, ingenuity and a crap load of labour.