Panorama of riverside buildings, London, UK, with Shard London Bridge, also known as London Bridge Tower, 2012, Renzo Piano (right) and City Hall, Foster & Partners, 2002, (left) Southbank, River Thames, London. Nicknamed the London Egg, the 45m high City Hall is the headquarters of the Greater London Authority. Its glass and steel structure incorporates environmentally friendly features such as solar panels. Picture by Manuel Cohen