National Palace Museum was created in 1965.
National Palace Museum of Korea was created in 1908-09.
Palace Museum in Wilanów was created in 1995.
Sheikh Zayed Palace Museum was created in 2001.
National Palace - Mexico - was created in 1563.
National Palace - Ethiopia - was created in 1955.
You probably mean National Palace (Palau Nacional, in catalan) in Montjuïc. Inside this palace is located the MNAC (National Arts Museum of Catalonia).
National Museum of Somalia was created in 1872.
National Etruscan Museum was created in 1889.
National Cartoon Museum was created in 1974.
Chuvash National Museum was created in 1921.
National Museum of Aleppo was created in 1931.
Gettysburg National Museum was created in 2008.