United States Botanic Garden Conservatory

Artifacts and stories from Indigenous cultures, plus the imagiNATIONS activity center where kids get to try things with their hands.

Landmark planes and spacecraft overhead, and a gallery on how flight works with a plane kids can sit in. Book the timed passes first.

Galleries inside and a sculpture garden outside, so when kids are done with paintings there is room to walk among the big pieces.

Every room has a kitchen, so snacks, breakfast and quiet evenings in are easy.

Loaner cribs, baby baths and swings at the front desk, so you can pack less. Ask ahead, there are only a few.

The founding documents themselves, with interactive displays that explain them. The line can run long, so go early.