Due to the major reconstruction, the museum was closed between 7 July 2011 and 28 October 2018. Seven million items had to be relocated to the museum’s depositories, in what has been dubbed the biggest moving of museum collections in Czech history. In February 2019, the museum's dome was opened for the first time, which also serves as a view of Prague. The eastern courtyard was also opened and was for the first time roofed, during reconstruction. Since November 2019, the underground corridor connecting the Historical Building to the New Museum Building is newly accessible.