Get picked up from your Yogyakarta hotel and head out of the city. Go 200 feet underground into Jomblang Cave with your local guide. As you explore, learn about the cave from your local guide. Stop to take in the light of heaven deep within the cave.

After leaving the cave, head to Pindul Cave. Go underground and climb into a donut boat. Float down the cave's emerald green water, admiring the stalagmites and stalactites. As you leave the cave, pass a roaring waterfall on the Oyo River.

Once you've explored the world below Yogyakarta return to your hotel.