London would be a dramatically different city if Sir Christopher Wren’s plans for rebuilding the capital after the Great Fire of 1666 had been completed. Over the past three centuries hundreds of visionary proposals have been designed for London. Most were never realised. Wren’s designs were shown alongside Richard Rogers’s 1986 proposal of ‘London as it could be’. Also shown were proposals for an airport to be constructed over King's Cross and an elevated railway down the middle of the River Thames.