Mortal Engines

This is a fun adventure story set in a weird future in which cities such as London are mobile, rolling around the countryside and consuming smaller settlements in what is wonderfully called Municipal Darwinism . So you can read this on the level of crazy YA adventure, or you can read this as a very scathing pun-filled commentary on modern urban capitalism.

Oh, and it's got airship adventures. Airships are always good :-)