<P> Built from 1406 to 1420 , the palace complex has undergone many changes . After serving as the imperial palace for some five hundred years , the Forbidden City became a museum , the Palace Museum , in 1925 . In 1987 , it was declared a World Heritage Site by UNESCO . </P>
<P> Built from 1406 to 1420 , the palace complex has undergone many changes . After serving as the imperial palace for some five hundred years , the Forbidden City became a museum , the Palace Museum , in 1925 . In 1987 , it was declared a World Heritage Site by UNESCO . </P>
when did the forbidden city became a museum
when did the forbidden city became a museum
1925
1925