This one's a BIG FAT GROWNUP BOOK! HA! It's mostly words but lots of pictures too. I thought it'd be interesting and you know what? It is. I think we should buy it so I can read it all the time. I like the one of the bridge falling apart into the river. I don't know what tunnels have to do with it, though. Bridges go over the water and tunnels go under the water. Maybe it's all about water.