The prehistorical caves where the fossils of Homo florensis were found. The small museum next to the cave has a replica of the skeleton, the original is in Jakarta. The caves themselves are not particularly special, but the surroundings and the road there are very pretty. Google maps will actually find the way here. Head north from Ruteng and follow the signs. Ask the helpful locals if unsure. Eventually, you end up at a small museum to the right painted in yellow. The exhibit is in Bahasa Indonesia, but the staff will try to translate for you and then accompany you to the cave (50 meters away) and show you its small secrets.