What the subject says. Starting a new campaign soon, and want to take a mostly sandbox approach: PCs explore landscape, find stuff to do. I'll be dropped some major adventure sites throughout the map - such as Rappan Athuk, Barrowmaze, Castle Xyntillan, Earthdawn's Parlainth, and maybe others - but am looking for resources for small locations to just populate the landscape, and wanted to see what folks here suggested. 1-2 page locations would be great: the type of stuff I can just plop down and run with little prep, as needed. I want to focus my prep time on world-building and reading the mega-dungeons and larger sites.
As it says, I'll be running 5E and would prefer 5E stuff, but it is only a mild preference - easy enough to convert.
Not that it hugely matters, but the setting is a homebrew - post-apocalyptic (magical), with somewhat of a sword & sorcery. I'm drawing from pre-published settings like the Hyborian Age, Midgard, Hyperborea, Forbidden Lands, Symbaroum, Talislanta, Earthdawn, etc.