Nineteen Smithsonian museums charge nothing, and two major D.C. institutions are marking milestones this season. Almost none of this costs a dollar. The foundation of any budget trip to Washington. The Smithsonian operates museums and a zoo across the city and admission is free at all of them, with no general entry charge. Most visitors underestimate how much this saves over three or four days. Book Air And Space One important exception to the walk-in rule. The National Air and Space Museum on the National Mall requires free timed-entry passes, which must be reserved in advance and do run out

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