Don’t forget the continuously inhabited pueblos!!
The Taos Pueblo, Orayvi, and Sky City (Acoma) were all founded sometime before 1150AD and have been continuously inhabited since then.
There’s the Medicine Wheel in Wyoming - called Annáshisee by the Apsáalooke, who also say that it was there before they arrived. We don’t know how old it is. Oral history from several different indigenous tribes say it was built by ancient ancestors who lived without iron.
And then there’s the Serpent Mound in Ohio, which, by the way, is the largest serpent effigy in the world.
Radiocarbon dates it back to at least 300 BCE. (2300 years ago), so, you know — the time of Ptolemy and the Punic Wars, and was later repaired by indigenous people about 900 years ago.
This just scratches the surface. So, yeah, we have a lot of old as shit stuff here built by indigenous people. Don’t even get me started on South America.