3 must-see attractionsTrafalgar Square, London Bridge and Big Ben are 3 spots that you simply cannot miss in this incredible city. Trafalgar Square, a beautiful landmark with Nelson's Column towering high above, is definitely worth a visit. London Bridge is one of the most popular attractions in the city. Take a walk over the bridge, or along the River Thames, an area jam-packed with British history and culture. See the tallest building in the UK, the Shard, which has a viewing gallery on the 72nd floor, giving you the most incredible views over London. Finally, head over to Big Ben, London's famous clock tower, next to the Houses of Parliament.