The Freedom Trail, Boston (Photo: reynolds.james.e / Flickr)

America is the land of the free—and that applies to many of the country's star attractions as well. Make the most of your summer by visiting these famous spots around the United States; you won't have to pay a penny to do it. 

The Freedom Trail, Boston

Learn history, see the city, and get some exercise at the same time with a walk along Boston's Freedom Trail. This 2 1/2-mile path highlights 16 sites that are historically significant to the American Revolution, and they are all free. Visit the Freedom Trail's website to read up on the Bunker Hill Monument and the Paul Revere House, among others, and prepare yourself for a self-guided tour. Best of all, for the directionally challenged, the trail is clearly marked the whole way by a red painted line or a brick path.