This is a great idea but I'd definitely make the distance configurable. Where I am right now would need several hours walking to reach anywhere Wikipedia worthy but if I expanded to say a 15km circle there's probably a couple of places of interest.

Meanwhile if someone lives in a city they'll get loads of results.

EDIT: actually this is just a wrapper around wikipedia's nearby feature I think. I tried a couple of places and they give identical results.

https://en.wikipedia.org/wiki/Special:Nearby#/coord/15.90721...