After a collapse there’d still be people nomading all over the place so they’ll find it eventually, just about anywhere. Near a place likely to be valuable for hunter-gatherers like a river mouth or lake. Or at a mountain pass where travelers will be funneled towards.

Tibet? Central Australia? Mongolia? Canada? With the way climate change is going somewhere not too hot might be best. Tasmania, New Zealand, Finland, Iceland…

Maybe the makers were on a budget and needed somewhere nearby. Or maybe they just wanted to make a point and have a laugh.

If the the creators were serious about the monument they’d have put it far away where extremists couldn’t easily bomb it. They should have been able to foresee the rise of reactionary forces as the collapse neared.

Still, plenty of time to make another.