On the internet there are lots of lists on what bookshops you can visit in the world.  Having been to a few of these.. from my perspective the best one is the one that haves what you need and provides a range of material which inspires and challenges you.. (a lot like a library right?!). 

In Adelaide the options are pretty limited. But if I was in England I would go to Foyles – what an amazing bookshop!!! Loved it – so many books I wanted to buy – but didn’t. There are a lot of floors, and a cafe and gallery in the top.  If you are going to London – go here!