The Woman Riding the Beast

In chapter 17 of the book of Revelation, a fallen rich woman or “great harlot” is described who sits on a scarlet beast with seven heads and ten horns. She is called “Mystery, Babylon the Great, the Mother of Harlots and of the Abominations of the Earth.” She is identified as a “great city,” sitting on “seven mountains” or hills. What is meant with these symbols? And what is the meaning of the “dreadful and terrible” fourth beast in Daniel 7, having “huge iron teeth” and ten horns, and the “little horn,” coming up among the ten horns, speaking “pompous words against the Most High,” intending to “change times and law,” subduing three kings and persecuting the saints of the Most High for “a time and times and half a time”?