Courtney B.
Google
Beautiful caves with very good accent lighting and sturdy walkways and stairs throughout. I could literally spend all day inside the cave. If you don't speak Portuguese, call ahead and try arranging for an English tour guide. I didn't but still enjoyed the tour even though I couldn't understand a word the guide was saying.
Contrary to what Google maps says, there is not a natural history museum here. There is one skeleton of a prehistoric animal inside the one cave, but that's all.