Humboldt’s historical interpretation of the age of European discoveries and the early phase of Ibero-American colonialism has also left its traces in the Krakow estate. Adding to the materials from the thematic section on the history of discovery and cartography, Humboldt proves to have a scholarly interest in American linguistic diversity. Here, the research interests of the two Humboldt Brothers correspond. Alexander collects materials on North and Mesoamerican linguistic and cultural history as well as information on the archaeology of early American civilizations, which he then compares to the history of the so-called Orient (above all Egypt) and the cultures of East Asia.