There are about 50 different museums in the city. Yekaterinburg has unique museum collections, such as the collections of Russian paintings in the Yekaterinburg Museum of Fine Arts and the Nevyansk icons in the Nevyansk Icon Museum, with more than 300 icons representing the eighteenth through the twentieth centuries on display. There is also a unique exhibit, the Kaslinsky cast iron pavilion, which received awards at the 1900 World Exhibition in Paris. Museums of the city also have collections of jewellery and stone ornaments. The United Museum of Writers of the Urals presents exhibitions in memory of writers such as Dmitry Mamin-Sibiryak and Pavel Bazhov. It also is the home of the "Shigirskaya Kladovaya" ("Шигирская кладовая"), or Shigir Collection, which includes the oldest known wooden sculpture in the world. The sculpture was found near Nevyansk and originally estimated to have been made approximately 9,500 years ago, but now is estimated to have been made 11,500 years ago. Yekaterinburg museums annually participate in the international event Long Night of Museums.