Big Ben, the Houses of Parliament, Trafalgar Square, Buckinham Palace, Tower Bridge and more landmarks can be found in London. A great way to see lots of them in a short space of time is by going on a walk up the Thames from Westminster Bridge to Tower Bridge. First you'll see the Houses of Parliament and Big Ben, then the London Eye, while further down the river you'll see St Paul's Cathedral, the Gherkin Building, Tate Modern, Tower of London and, of course, Tower Bridge .