In the 1800s, Alexander von Humboldt was a superstar of modern science, dazzling kings, presidents, and Charles Darwin. Today, towns and counties across the U.S. are named after him, along with hundreds of plants and animals. He even has an honorary outpost on the moon. Despite these accolades, few know of him or his discoveries, which revolutionized our understanding of nature. Follow Humboldt’s footsteps, from the jungles of Venezuela to the volcanoes of Ecuador, and see how this young German explorer became one of the most influential scientists in history.