Each page contains a mystery item from the past, with a set of clues and red herrings as to what it was used for. Readers can take a guess before unfolding a giant flap to reveal the answer. Without giving too much away, the book contains Inuit snow goggles, designed to protect eyes from the blinding glare of the ice, an ancient Chinese earthquake detector featuring several metal frogs, and err.. the Royal fistula—an item used to perform delicate surgery on the rear end of King Louis XIV of France.

Kids will delight in trying to work out the purpose of the beautiful objects, brought to life by Mexican illustrator Paula Zamudio, and will learn a lot about the cultures that created them – from ancient Rome to Polynesia, and Mesopotamia to Viking Scandinavia.