As Londoners look for ways to get out of the capital in this unusually hot summer, Transport for London is urging them to stay -- and make the most of their off-peak travel fares to have some unexpected city adventures. Agency M&C Saatchi commissioned six illustrators to design a poster in their own unique style, advertising destinations such as parks, zoos and museums with captions such as "Travel Around the World: Without Leaving London" and "Enjoy the Countryside: Without Leaving London." The resulting executions are eye-catching and stylish.