Bunker Hill Monument, Boston
Like the Washington Monument, the Bunker Hill Monument is a sky-scraping obelisk, although at 221 feet tall, it's less than half the height of its D.C. foil. The monument marks the spot where the American Revolution kicked off in 1775: The Battle of Bunker Hill in Charlestown (a neighborhood of Boston) was the first major fight in the war for U.S. independence. A museum across from the monument features artifacts from the battle, such as an authentic cannon ball and other Revolutionary War weapons. To get your full fill of American history while in Boston, walk the two-and-a-half mile Freedom Trail, which features 16 historically significant sites, including the Bunker Hill Monument.