London’s 21st-century waterside business district, Canary Wharf is best known for its cutting-edge architecture, including the 50-storey obelisk-shaped skyscraper, One Canada Square. Get there by the Docklands Light Railway, with elevated tracks giving wonderful views into a world of glass and steel. By contrast, historic Greenwich, home to the National Maritime Museum, is just across the Thames. A foot tunnel links the two.
