For who is a London but he has already seen the most famous tourist destinations and maybe he is passionate about modern architecture, I suggest going east, in the redeveloped area of the docks.
It's possible reach the area and see the buildings or by taking a nice cruise on the Thames, starting from Westminster Pier or Tower Pier towards Greenwich, or with the DLR (Docklands Light Railway), the light rail that passes through the area and from which you can enjoy a very beautiful.
I have done both routes even if on two different afternoons, from the City to Greenwich by boat and then strolling through the streets and squares of a less chaotic, well-kept London, with modern buildings flanked by old goods storage warehouses, which have been given new life thanks to major redevelopment interventions.
The area of Docklands and the old port of London which from the beginning of 1800 until the Second World War was one of the largest ports in the world. Here came the great ships from India and the Americas, laden with all the merchandise that was then traded and sold in the rich shops of the city and throughout England. It was then abandoned for years and around the 80s it was used as an expansion area, without volume restrictions and with the possibility of making substantial building investments.
This is how office / residential complexes have arisen, the most important of which is that of Canary Wharf, with financial offices, banks, newspaper offices, upscale homes, a luxury shopping mall, pubs and restaurants where businessmen stop for a pint after work. Part of the City's business has moved here, where managers, journalists and bankers who decide the fate of the international financial markets come together.
Along the streets from Canary Wharf to Limhouse you can also admire the old buildings on the south bank of the Thames and the panorama of the City, with its modern skyscrapers that, despite the distance, stand out against the London skyline.
In Limohoause there is also one of Gordon Ramsay's restaurants: The Narrow, but not even the shadow of the famous and gruff chef. The restaurant overlooks the River Thames at a point where the river forms an inlet and forms a small harbor where sailboats, speedboats and several modern residential buildings are located. A nice walk in contemporary and modern London.