National Portrait Gallery

Step into picture-book worlds and read, sketch and build inside them. It's pitched at kindergarten through third grade.

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

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

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

A kids' concierge for 11 and under and a library of kids' books, so the hotel helps you plan the day around them.

Wonderplace for small kids and Spark Lab for young inventors. Check the play areas are open before you go.