The Museum of Nikola Tesla in Belgrade keeps complete personal belongings of Nikola Tesla, which were, according to his last will and thanks to the exceptional efforts of his nephew Sava Kosanović, collected and transfered to Belgrade after his deathin New York in 1943. The wealth of arhive material, consisting of more than 150.000 various document referring to the life and creative work of Nikola Tesla, as well as the significance of his inventions which are presented at the exhibition, make this Museum a unique institution both in Yugoslavija and in the world.