Bartolome is an islet off the coast of Santiago, and has some of the strangest, most beautiful lava formations we've seen so far.
This is Pinnacle Rock, one of the landmarks of the Galapagos, seen from two sides. (In the photo on the right, look for a tiny white dot on top of the larger of the two rocks in the bottom-right corner. That's a bird. Just for a sense of the scale. There's also a bird towards the bottom of the rock in the photo on the left.)