Washington DC vs Chicago

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.

Chicago is the American city that gave the world the skyscraper, and it still shows off its skyline better than almost anywhere. Glide along the Chicago River on an architecture cruise as guides decode Art Deco towers, glassy modern giants and the movable bridges overhead. Stroll Millennium Park to see your reflection bend in Cloud Gate, then follow the Riverwalk past cafes, kayakers and wine bars tucked below street level. Dinner means deep-dish pizza, a buttery, cheese-loaded pie that takes about 40 minutes to bake and is worth every one, though locals will also steer you toward tavern-style thin crust and an Italian beef. Evenings belong to Lake Michigan: ride a bike along the Lakefront Trail and watch the towers catch the last light at sunset. The L trains make it easy to roam without a car, from Loop landmarks to neighborhoods like Wicker Park and Lakeview. Stay longer and add the Art Institute's world-class collection, Navy Pier, a game at Wrigley Field, the lakeside Museum Campus and the free Lincoln Park Zoo. Summer brings festivals and patio season; winter brings serious cold, but also holiday markets and cozy blues clubs.