In 1783, Congress passed a resolution approving an equestrian statue of George Washington. Plans were made to erect it at the site of the present Washington Monument, but Washington objected to the idea. After his death in 1799, plans for a memorial were discussed but none was adopted until 1832, when blocks of stone began to be collected from each state, some foreign countries, and private individuals. The 555-ft (169-m) monument was finally completed in 1884. Its tip is made of what? Discuss