The Freedom Trail, Boston
Study history, see the city, and get some keep fit at the same time with a walk next to Boston's Freedom Trail. This 2 1/2-mile path highlights 16 sites that are in the past important to the American Revolution, and they are all free.
Great Smoky Mountains National Park,
North Carolina and Tennessee
Enormous Smoky Mountains National Park is one of the few major American national parks that don't charge admittance (and there's in fact a deed limit on the land saying that no toll or fee will ever be forced).
Lincoln Park Zoo, Chicago
Lions, gorillas, and other wild creature live just minutes absent from downtown Chicago in Lincoln Park Zoo. The zoo is free and open every day of the year, making it an easy stop on any Chicago tour.
The National Mall, Washington, D.C.
From the new Martin Luther King, Jr. National Memorial to the famous Smithsonian Castle, some of America's most iconic sights can be found on the National Mall. The whole thing along this open-air national park is free, from world-class museums in the Smithsonian complex to historical sites, such as the Capitol.
Golden Gate Bridge, San Francisco
This year marks the 75th centenary of the Golden Gate Bridge, so why not celebrate with a visit? Don't spend money on a tour; instead, download a free app (available for iPhone and Android) and learn behind-the-scenes trivia, get expert advice and yet listen to recordings of bridge workers' oral history.
Independence National Historical Park,
See America's second birthplace, Philadelphia's sovereignty National Historical Park. Even though Washington is the nation's capital, Philadelphia was the home of Congress and the Supreme Court for 10 years while the District was being built.
The Getty Center, Los Angeles
The Getty Center, one of Los Angeles' best art museums, is free. Permanent exhibition characteristic vital pieces like Vincent Van Gogh's Irises and Claude Monet's Sunrise (Marine), and there are always revolving showing like Portraits of Renown:
Jackson Square, New Orleans
Knowledge the real feel of New Orleans in Jackson Square. This public space houses an open-air artist settlement where you can browse or buy work by local artists (or even just watch them create).
International Rose Test Garden, Portland, Ore.
Make time to stop and smell the roses—all 10,000 of them—at Portland's International Rose Test Garden. This 4 1/2-acre garden features new diversity of roses, delightfully maintained landscaping, and the Shakespeare Garden, which take in herbs, trees, and flowers mentioned in The Bard's works.
Central Park, New York City
A green oasis in the middle of active Manhattan, Central Park offers open spaces, good-looking views, and peace and quiet. Tour the 55 monuments, monument, and sculptures, watch a game at one of its 26 ball fields, or hike 130 acres of woodlands.