Yad Vashem (יד ושם) is Israel´s official memorial to the victims of the Holocaust established in 1953 through the Memorial Law passed by the Knesset, Israel´s parliament.
The origin of the name is from a Biblical verse: "And to them will I give in my house and within my walls a memorial and a name … that shall not be cut off." (Isaiah, chapter 56, verse 5) In Hebrew, "a memorial and a name" translates as yad va-shem.
Located in Jerusalem, it consists of a memorial chamber, a historical museum, an art gallery, a Hall of Names, an archive, the "Valley of the Destroyed Communities," and an educational centre. As well, non-Jews who saved Jews during the Holocaust, often at great personal risk, are honoured by Yad Vashem as the "Righteous Among the Nations".
Taken from Wikipedia.org