Dec 19 1800 - Mar 5 1801 & Mar 19 -Apr 29 1804

Jan 6 - Jun 9 1802

Jun 19 1802 Climbed Tungurahua

Jul 13 1802

He was in St Petersburg in May 1829 (on his expedition to Siberia) and was treated as a personal guest by the Tsar.

1804

He was in Lima 22 Oct - Dec 24 1802

Apr 20 - Jun 5 1799 stayed with the Spanish King

Aug 4 1803

Sep 14 1803

Mar 30 - Apr 6 1801

Aug 3 1804 - arrived by sea

Visited in 1803/4. In 1810 he published a description and plate.
See olivercowdery.com

Jun 21 1799 Climbed Teide

In 1803, a German scientist, Baron von Humboldt, visited New Spain and studied Cuicatlán’s flora (AB ev)

Als der deutsche Forscher Alexander von Humboldt 1801 seine Südamerika-Reise unternahm, rastete er vom 25. April bis zum 5. Mai in Mompós. (wiki)

One of the first people to mention the road in his writings was the German naturalist Alexander von Humboldt, who visited the Andes in the late eighteenth and early nineteenth century (nom file)

Apr 12 1803 - Jan 20 1804; Whilst in Mexico city he lived at 80 Rep. de Uruguay in the historic center of the town (building can still be seen)

May 24-29 1804, Jun 18-30 1804

Aug 8 1803

From Humboldt's "New Spain" vol II "In the northern part of the intendancy of Vera Cruz, west from the mouth of the Rio Tecolutla, at two leagues distance from the great Indian village of Papantla, we met with a pyramidal edifice of great antiquity. The pyramid of Papantla remained unknown to the first conquerors. It is situated in the midst of a thick forest, called Tajin in the Totonac language. ? The Indians concealed this monument, the object of an ancient veneration for centuries from the Spaniards; and it was only discovered accidentally by some hunters about thirty years ago."

His diary states "...Where we stayed for 4 or 5 days and which yielded 5 shells and 3 lichens".