Specifically refers to the former imperial palace of the Ming and Qing dynasties in Beijing; also known as the 紫禁城 zǐ​jìn​chéng.

A palace left behind by a former dynasty.

Short form for the 故宫博物院 gù​gōng​bó​wù​yuàn, referring to either the museum in Beijing or the National Palace Museum in Taipei.