I recently visited three nearby places that had been listed as having large roof caves (by Finnish standards). And they did indeed deliver on that promise! In addition, I found that the three actually had three roof caves each. Nine cave visits on three trips :-)
I also draw maps of all nine caves, linked from the articles above.
I had not realized there were this big caves (even if just roof caves) nearby, but found them through the cave map tool that Ralf and I are developing. Each individual cave is also accessible via the tool using a URL, e.g., Limpan's cave.