The Washington Monument is capped with a 9″, 100 ounce aluminum pyramid. Aluminum was a precious metal in 1884 and the pyramid was displayed at Tiffany’s jewelry store in New York before it was placed at the top. – WTF Fun Facts
Source: http://www.americaslibrary.gov/jb/gilded/jb_gilded_monument_3.html
WTF Fun Fact – Washington Monument Precious Aluminum
