Daunt Books

This is the original in a chain of six bookshops specialising in travel, and is located in an Edwardian former bookshop. It's one of the most beautiful shops in London and worth visiting just for the architecture alone. The books are arranged in geographical sections and you could spend hours here browsing through them. They have a well curated selection of non-travel books on the ground floor, including literary fiction, and the monthly evening talks with authors are definitely worth attending. See their website for more details.