5. Washington DC

Washington DC

If you are a US resident, you probably have visited Washington DC at some time. And if not, you are missing out. The key to D.C.'s family appeal is the National Mall, which is surrounded by free, kid-friendly museums and renowned monuments. If you have some extra time, spend a few hours at the National Zoo (which also offers free entry) or snag a treat at one of Georgetown's cupcake shops.

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