Smithsonian National Museum of the American Indian

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

A glasshouse of tropical plants and desert displays, so kids can go from jungle to cactus in a few steps.

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

Carved horses and an accessible chariot for riders who can't climb on, right between the museums.

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

Dinosaur skeletons, animal halls, minerals and ocean displays under one roof, so each kid finds a room they want to stay in.