[cableshaft]

There are older structures and artifacts than 250 years, they're just not European in origin. Like Cahokia Mounds in Illinois: https://cahokiamounds.org/

Arrowheads are an example of something that's not too difficult to find in the wild if you know where to look.

[contingencies]

A few years ago I made a graphic showing the years before present dates of some of the earliest archaeological sites across the Americas for Wikipedia: https://en.wikipedia.org/wiki/Peopling_of_the_Americas https://en.wikipedia.org/wiki/Alternatives_to_the_Clovis_Fir...

[stephenhuey]

I've been to Cahokia, and look forward to revisiting it in future decades since only 10% has been excavated so far!

[cableshaft]

Same!

[rigonkulous]

Narwala Gabarnmang says hi: https://en.wikipedia.org/wiki/Gabarnmung

44,000 years of continuous human occupation. (Except for a brief period during the 20th century ..)

[jghn]

Also if one expands it to the Americas more broadly it goes back pretty far. Earlier this year on a trip to Central America I stayed in a home that dated to the mid-16th century. Still not as impressive as what Europe has, but was neat!

[DougN7]

Those are very cool. Worth a visit if you’re ever in the St Louis, Missouri area.