Caves that have torches along the way means there are bandits, necromancers, conjurers or other inoffensive NPCs, by following the torches it will eventually lead to them. Some caves have unique treasures, some of which can be acquired by solving little 'puzzles'. Ropes to climb, some of which lead to hidden treasures. Some areas are too tight to pass, so you need to choose the option to squeeze through. Caves that allow light have some plants growing inside, so now you can also harvest ingredients from vegetation inside the cave. Are you tired of all those bland, dreary, cookie-cutter caves? This is the mod for you! Better Dungeons makes almost all the caves unique and interesting.