I ran across this discovery when looking at pre-inca civilization in SoAm.
The layout is remarkably like Machu except no buildings of note. Did the Perdidaians move to Machu or did the Machuians move to Perdida? Cousins? Prior civilization?
https://www.thevintagenews.com/2016/12/12/ciudad-perdida-the-lost-city-of-colombia/
I’ve heard tell that there was a small pile of firewoodwood in front of each of the entrance doors of the M.P. structures. In that culture, it meant the occupants had left for a while and would be back. The site was slowly, or perhaps not so slowly, abandoned. It was the summer place for the Inca (the Inca was the ruler, not the people) and the last time they left at the end of summer, they never went back, apparently due to the Spanish conquest.
There are other sites that Bingham found, two of which are well-documented, and one was the last capital of the Incas. A site that he found further east remained lost for a second time, I saw a documentary about the search for it, apparently they found it again, but it didn’t look like much. The overgrowth would of course hide a lot.
Sister site of M.P.:
https://traveloutlandish.com/blog/choquequirao-ruins-peru/