If your trip to London is all sorted out but your itinerary is looking a bit empty, we can give you a few hints and tips.You might need to ask the boss for some more time off, because London is bursting at the seams with famous sights and landmarks. First cab off the rank should be Trafalgar Square and Big Ben. You won't want to miss Buckingham Palace and St. Paul's Cathedral either.Explore the best that this city has to offer by adding Nelson's Column and National Gallery to your schedule. If you've got an extra day to spare, have a look at St. Martin-in-the-Fields and London Coliseum too.Plan a stop at The Shard. It's one sight you'll find on many visitors' must-do lists. Oxford Street and London Bridge are also close by and worth a pit stop.