London is a major tourist destination known for its four world heritage sites, royal parks, and iconic landmarks along the River Thames such as the Houses of Parliament, Tower Bridge, Tower of London, Westminster Abbey, and Buckingham Palace. Other attractions include institutions like the British Museum and National Gallery as well as shopping, nightlife, and entertainment in the West End. The document provides photos of various landmarks in London such as Tower Bridge, Big Ben, London Eye, Palace of Westminster, St. Paul's Cathedral, and Buckingham Palace.