Polo.

Polo by Régis Faller (2006) has no words (except sound effects), but it doesn't need them (it was written by a Frenchman). The pictures tell you what's happening. It's a great way to show how you can say things without using words. Polo is a dog who travels to imaginary places. All the places Polo visits have things that don't happen in real life, like an elevator built inside a tree, a boat made of ice, or an underground country of giant blue mushrooms. I recommend this book for ages 3 and up.