20 of the pieces in this 1000-piece puzzle are specially shaped and contain secret London locations, from 13th-century ruins and mysterious signs to teeny tiny sculptures and lavish lavatories. But there's a catch - you won't know where to find them until you slot them into place! On the accompanying poster you'll find an explanation for every item and location by tour guide Jack Chesher, author of the bestselling book London: A Guide for Curious Wanderers.