History plaques. Wall mounted and memorial style. (Especially wall mounted.) It would be really neat if you could write a description on them that was click-readable, like real plaques you find in zones.
We already have decorative exploration markers available, but how about setting them up so that there's an actual exploration badge associated with them. Say, a base can install a single, active exploration marker. If you visit eight bases with these, you earn an exploration badge. Call it... All About That Base (No Trouble). Or maybe... All Your Base Are Belong To Me.