Colorado Rockies vs Washington DC

The Colorado Rockies pack big mountain scenery within easy reach of a lively city, which makes them perfect for a long weekend. Start in Denver, the Mile High City, where food halls, breweries and green-chile-smothered everything have turned neighborhoods like RiNo, LoHi and Union Station into a serious food scene. Just 30 minutes west, Red Rocks Amphitheatre sits between towering sandstone slabs and is one of the world's most famous places to see a concert, or simply to climb the stairs at sunrise. From there the mountains take over: Trail Ridge Road in Rocky Mountain National Park climbs past 12,000 feet above treeline, and the old mining towns of Idaho Springs and Georgetown, plus the gateway town of Estes Park, make charming bases. With more time, head to Breckenridge, Vail, Glenwood Springs' hot springs pools, Aspen's Maroon Bells and the red rocks of Garden of the Gods near Colorado Springs. Plan ahead: Rocky Mountain National Park requires timed-entry permits in summer and early fall, the Maroon Bells need a shuttle or parking reservation, and the altitude is real, so drink plenty of water and take the first day easy.

Washington DC may be the best family city in America, mostly because so much of it is free. In three days with kids you can stand under real spacecraft at the National Air and Space Museum, meet the Hope Diamond and towering dinosaur skeletons at the National Museum of Natural History, and see the original Star-Spangled Banner at the National Museum of American History, all without paying admission. Some sites use free timed-entry passes, so reserve them before you go. Between museums, let kids run on the grassy National Mall, ride the carousel and picnic with food-truck lunches. Save an evening for the monuments at sunset, when the Lincoln Memorial glows, the Reflecting Pool mirrors the Washington Monument and the crowds thin out. The Metro makes getting around easy, and younger children ride free with a paying adult. With more time, see giant pandas, elephants and great apes at the free National Zoo, tour the US Capitol and the stunning Library of Congress, crack codes at the International Spy Museum, and day-trip to George Washington's Mount Vernon and the brick sidewalks of Old Town Alexandria. Spring and fall are ideal, with cherry blossoms in late March to early April.