The Kutafya Tower, which forms the main visitors’ entrance today, stands apart from the Kremlin’s west wall, at the end of a ramp over the Alexander Garden. The ramp was once a bridge over the Neglinnaya River and used to be part of the Kremlin’s defences; this river was diverted underground, beneath the Alexander Garden, in the early 19th century. The Kutafya Tower is the last of a number of outer bridge towers that once stood on this side of the Kremlin.