In my opinion, London is one of the greatest cities in the world for tourists. You just can't ever get bored, there is so much to see and do. However, what if you have only one day to visit and explore London? Maybe you have a long layover at one of London's many airports and want to see London but need to cram it in as short a timeframe as possible. This guide will explain what you need to see, and includes some other tips and advice for travelling to London.