POLIN Museum of the History of Polish Jews is a museum on the site of the former Warsaw Ghetto. The Hebrew word Polin in the museum's name means, in English, either "Poland" or "rest here" and is related to a legend on the arrival of the first Jews in Poland. The cornerstone was laid in 2007, and the museum was first opened on April 19, 2013. The museum's Core Exhibition opened in October 2014. The museum features a multimedia narrative exhibition about the living Jewish community that flourished in Poland for a thousand years up to the Holocaust. The building, a postmodern structure in glass, copper, and concrete, was designed by Finnish architects Rainer Mahlamäki and Ilmari Lahdelma.