I'm not a big airplane geek, but I appear to be related to 4 or 5, and hey, who can pass up a chance to see the Space Shuttle?  We took a weekday and went to the Smithsonian's Air and Space annex, at Dulles airport in Virginia.  This is a brilliant museum - the curators did a fantastic job of creating a three-dimensional display space for airplanes, helicopter, hangliders, and spacecraft.  The hardcore military history buffs were enraptured, and so was the two-year-old boy…for 4 hours.  FOUR hours, people!

The weekday lack of visitors meant that the kid had room to stretch his legs and burn off some toddler energy, but the stroller was very nice to have also.  He loved looking up and down at the aircraft, and getting close up to things he's only seen in pictures.  The "virutal cockpit" kiosks were placed at child height and operable by a toddler, but the displays of model aircraft were more interesting to him.
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Swinging with the wild things.

Philadelphia's Please Touch Museum. Seriously.  Would. Not. Leave.  Kept asking to go back.

Full-size city bus.

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