Existing comment:
Alexander von Humboldt
Natural Bridge of the Icononzo, plate 4, from Researches, Concerning the Institutions & Monuments of the Ancient Inhabitants of America, London
1814
engraving
In his book Views of the Cordilleras, Humboldt compared this South American natural bridge with the one Jefferson had described in his Notes on the State of Virginia, noting: "A phenomenon, similar to the upper bridge, of which we have just given the description, exists in the mountains of Virginia, in the county of Rockbridge. This Mr. Jefferson has examined with an attention, that distinguishes all the observations of that excellent naturalist."
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