The book focuses on the travels that connected the two brothers, Alexander and Wilhelm von Humboldt. For both of them, it was important to ‘experience’ new knowledge and insights into the unknown in the truest sense of the word. The places travelled by the Humboldt brothers are marked in the texts. A fine line connects the places where the brothers met or could have met—because they were rarely in the same place at the same time. The splendid, surprisingly colorful design of the catalog is based on the classicist style of many of Alexander von Humboldt's original publications. The impressive folios of the time are characterized by generous white space, blocked lettering, verse setting, fine lines, and refined graphic details, as well as artistic copperplate engravings, often colored with pastel yet intense colors.