I went to Algar do Carvao). It is a cave from one of the volcanos here that helped form the island that I now call home for part of the summer. I acened these stairs that looked like some vampiric hallway toward a new life as a blood sucking immortal, into the amazing belly of the volcano. Whats interesting about this one is it never errupted, but magma did fill the inside at one point. The liquid magma was so hot that it burned through the ground into the center of the earth. And! there are a geological and biochemical phenomena which allows the formation of stalactites and stalagmite of amorphous silica. Very interesting. Also, it was almost rainy in the cave because the ground was so saturated from the rains, I got a little glimpse on how the water is absorbed into the earth and makes natural aquifers or lakes like the one in the cave. More than anything it was absolutely incredible to be inside the earth completely surrounded by rock, water, and foliage imagining the power of nature... what is could do, what it did do, and how has it effected life now.