Maybe garden history isn't as 'uncool' as I thought! For it is part of 'Garden of Time' which is, apparently, 'one of the most popular free hidden object games (HOG) on the web'.
Playable first on on Facebook, The Gardens of Time App is available for free from the App Store on the iPad, iPhone and iPod touch or at http://www.itunes.com/app/gardensoftime
