In 1845, a corresponding member of the Archæological Society of Belgium.
In 1846, Doctor of Laws by Yale College.
In 1848, the first decoration ever bestowed by the Sultan of Turkey upon a citizen of the United States, Nishan Iftikar, in diamonds; he was also made a member of the American Philosophical Society, Philadelphia.
In 1849, a Fellow of the American Academy of Arts and Sciences, Boston.
In 1851, a golden snuff-box containing the Prussian golden medal for scientific merit.
In 1852, the Great Gold Medal of Arts and Sciences from the King of Würtemberg.
In 1855, the Great Gold Medal of Science and Art from the Emperor of Austria.
In 1856, the brevet and decoration as Chevalier of the Imperial Order of the Legion of Honor, from the Emperor of France.
In 1856, the Cross of the Order of Dannebrog from the King of Denmark.
In 1858, a member of the Royal Academy of Sciences in Sweden.