Don't just wander the earth's surface — take a peek at what's underneath it too. See bizarre natural formations and shapes in the deep, dark recesses of Gruta das Torres.
You'll be spoiled for sightseeing choice when visiting Madalena. Gruta das Torres is a great place to kick off here, but there are many other worthwhile places to consider. Pico Island Vineyard Culture, Mount Pico, and Museu do Vinho are near the natural underground attraction and will top off your day nicely.