In Russian language the word kremlin is used to describe a castle or an important fortified complex. Therefore, one can easily conclude that every major Russian city had its own kremlin during some time in history, but the one in Moscow is definitely the most famous one. It is still active today which makes it the largest active fortress in Europe. It hosts five palaces and four Cathedrals. #moscow #kremlin #castle #complex #famous #history #palace #cathedral