Schinkel, however, is famous as well for his theoretical work and his architectural drafts. Some of his merits are best shown in his unexecuted plans for the transformation of the Athenian Acropolis into a royal palace for the new Kingdom of Greece and for the erection of the Orianda Palace in the Crimea. These and other designs may be studied in his "Sammlung architektonischer Entwürfe" (1820–1837) and his "Werke der höheren Baukunst" (1840–1842; 1845–1846). He also designed the famed Iron Cross medal of Prussia, and later Germany.