The highest navigable lake in the world, at 3,812 meters, so vast and so blue it looks like the sea. On Titicaca, the Uros people live on floating islands made of totora reeds that they weave and renew themselves; farther out, Taquile Island preserves textiles declared World Heritage. You sail between sky and water, with the mountain range behind and the thin air of the altiplano. A sacred place, alive.