With its sophisticated architecture, design, and foodie appeal, Barcelona might seem like a city just for grownups, but it has plenty to offer children of all ages. Much of the fun is outdoors, from the amusing architecture of Parc Güell to the family-oriented waterfront and zoo in the city's largest park. Even transportation can be exciting: Kids are sure to love the aerial cable car from the port to Montjuïc and the antique Blue Tram that climbs the hill to Tibidabo. >>more

What's the best part about visiting Chicago with your kids? Free activities abound: Parks, a zoo, and the beach are a few of Chicago kids' favorite things -- and they won't cost you a penny. Transportation is easy: Kids love the "El," carriage rides, trolley cars, and buses. And most activities are located around a compact city center -- a bus or train ride from many hotels will get you to any of the downtown museums or the Lincoln Park Zoo in just minutes. >>more

London is one of Europe's best playgrounds for kids. Nearly all the city's major museums have developed well-thought-out activities to entertain and inspire kids on weekends and show off the collections to their best advantage. Whether you make it to all the venues on this tour obviously depends on the temperaments and ages of your children. >>more

Families flock to Oahu not only for the island's breathtaking beauty, but also for the abundance of activities. Waikiki is famous for every type of ocean activity you can think of, plus there's the Honolulu Zoo, the Waikiki Aquarium, and fun-filled Kapiolani Park. Dotted around the rest of the island are great family outings like Sea Life Park, the Polynesian Cultural Center, and even a water adventure park. >>more

Here's a bold statement: Disney World included, there is no better place to take the kids on vacation than Washington, D.C. Think about it -- the District is overflowing with the stuff of great field trips: baby pandas, dinosaur bones, spy stuff, rocket ships, insect gardens, historic monuments. There's even a park that is so close to an airplane runway, you feel as though planes are landing on top of you. >>more

On the one hand, Singapore's humid weather, unfamiliar languages and institutionalized spanking will turn off many children. On the other, children are treated with a reverence they can't get at home, which makes it feel as if the water parks, cool temples, and the world's most exciting zoo were made just for them. >>more

On their own, Vancouver & Victoria give most other cities a run for their money in the family friendly department. Together, though, the combination of urban thrills, natural wonders and historic sights are a combination that is nearly unstoppable. >>more

With beaches, bridges, wildlife and fast boats, Sydney could easily pass for a theme park as well as one of the world's most important cities. Since it's on the other side of the world, kids will get a kick out of the swapped seasons and foreign fauna that quickly make it clear you're not in Kansas anymore. >>more