A kremlin (Russian: кремль, tr. kreml; IPA: [ˈkrʲemlʲ], fortress; same root as in kremen (Russian: кремень, tr. kremen; IPA: [krʲɪˈmʲenʲ], flint)) is a major fortified central complex found in historic Russian cities. This word is often used to refer to the most famous one, the Moscow Kremlin, or to the government that is based there.(Wikipedia)
"Inside the Kremlin"
"Grand Kremlin Palace"