The word kremlin means a fortress or a walled town. The earliest walls of the Kremlin were made of earth and wood; the present day brick walls date from the 1490s. Each of the 20 towers has its own history and quirks. The Kremlin covers an area of 27 hectares. Today the visitor entrance is through the Kutafya Tower and then through the Trinity Gate shown behind it.
A view of the street between the Congress Palace and the Patriarch's Palace.
With a bit of free time, I strolled around the Alexander Garden.