Pictures of the day: 29 November 2013 This lonely lavatory has been dubbed the most extreme toilet in the world perched on a cliff 8,500 feet above sea level in Siberia. The precarious privy in the Altai Mountains, Russia serves the remote weather station at Kara-Tyurek - literally Black Heart in the local South Altayan language - which began working in 1939. Five staff man the station at this outpost and this is their only toilet. They are visited once a month by a postman to collect the weather data, and a helicopter delivers supplies of food and water each autumn.Picture: CATERS