Isabela is the biggest island of the Galapagos archipelago, and Sierra Negra volcano, the second biggest crater in the world, is part of it. Today we explored the caldera, descending a few hundred feet to walk on its floor. At the end of the trail we admired the forces of Mother Nature as we observed a sulfur mine where some fumaroles have formed. Once there you see the steam thrown up into the air; the scenario is astonishing, like a moonscape. Many volcanoes are formed here and there, the black lava on one side as a desert, and the soil eroded by the rain and wind on the other side. Lava new and old mixes and creates a magical world in front of our eyes. The highlands of Isabela are full of beauty and lush vegetation. We had a wonderful experience and our guests enjoyed every minute of our visit to this incredible place, from spotting penguins and sharks on the coast, to vermillion flycatchers and finches at the summit.