The document is a school report about the famous Tretyakov Gallery in Moscow, Russia. It was created by a 5th grade student named Alexander Osipenko from School 1 in the Moscow Region of Electrostal. The report discusses how the Tretyakov Gallery was founded in 1856 by Russian merchant Pavel Tretyakov who aimed to create an art collection of works by Russian artists of his time. It later merged with a contemporary art gallery in 1985 and is now housed in a modern building along the Garden Ring in Moscow.