Geneva is the second most populated city, with a population of approximately 185,526 people, in Switzerland. Geneva is situated on Lake Geneva and is an important city to the entire world, because of its involvement with international organizations, including the European headquarters of the United Nations. Geneva became a Canton (district) in 1815. The Geneva Convention--to protect the sick and wounded in war time--was signed in 1864. Notable sites to mention include the Flower Clock, the Art and History Museum, the International Red Cross and Red Crescent Museum and the Palais des Nations, the European headquarters of the United Nations. The most noted landmark is the Jet d'Eau fountain; its 140m water column is visible from many parts of the city.