Cast - Iron Architecture (1894, a collection of iron made architectural designs, notably the Eiffel Tower. Digitally enhanced… Free Image from public domain license 
The Great Bartholdi Statue, Liberty Enlightening the World, published by Currier & Ives. Original from Library of Congress.… Free Image from public domain license 
The great east river suspension bridge, connecting the cities of New York and Brooklyn published by Currier & Ives. Original… Free Image from public domain license 