Few cities can compare to London for culture, modern history, commerce, or, for that matter, the ubiquity of mass-transit offerings. Indeed, in this famously pricey city, the Tube, buses, or walking are the best modes for getting from A to B . As for what to see, there are enough famous landmarks here to keep you busy for a year, but must-sees include the Tower of London, Buckingham Palace, Big Ben, the Tower Bridge, and Westminster Abbey. Get a bird's-eye view of everything on the London Eye, or lose track of time amid the manicured gardens of Kensington Park and Hyde Park. Shop, stroll, and celeb-hunt in Knightsbridge, on Saville Row, or in Chelsea. Relive Beatles history on Abbey Road, or explore the street market on Portobello Road.