It’s been a while, but I do—from time to time—like to write about those random words/concepts that just float through my brain, taking up space and attention until I look them up to remind myself what they mean (or confirm my memory of the definition). Today that’s "karst" - landforms created by dissolving limestone and similar types of rock. This can make for some pretty cool stuff, like Luray Caverns in the above photo.
Well it turns out there's a whole Virginia Cave and Karst Trail with *loads* of awesome places to explore, and now probably the basis for my next regional tourism checklist.