Rev. 14:20 – Then the press was trampled outside the city, and blood flowed out of the press up to the horses’ bridles for about 180 miles. (HCSB)
Finally in this chapter, John records, “Then the press was trampled outside the city, and blood flowed out of the press up to the horses’ bridles for about 180 miles” (v. 20).
Commentators generally agree that the city in question is Jerusalem. It is called “the great city” in Rev. 11:8, as well as “Sodom and Egypt, where also their Lord was crucified.” The reason the wicked are destroyed outside the city is that this is where accursed and unclean things are taken for disposal. For example, the Valley of Hinnom outside Jerusalem is where human sacrifices take place in Old Testament times. It is a burning trash dump in Jesus’ day. Even the carcasses of sacrificial animals, whose blood the high priest carries into the Holy of Holies on the Day of Atonement, are carried outside the city walls and burned.
But the writer of Hebrews reminds us that Jesus is crucified outside the city in order to identify with sinful people. The One who knew no sin becomes sin for us, and the blessed Son of God becomes a curse: “For the bodies of those animals whose blood is brought into the most holy place by the high priest as a sin offering are burned outside the camp. Therefore Jesus also suffered outside the gate, so that He might sanctify the people by His own blood. Let us then go to Him outside the camp, bearing His disgrace” (Heb. 13:11-13).
Other interpreters see this simply as an allusion to Old Testament purification laws where the unclean are taken outside the camp (Lev. 8:17; 9:11). Still others understand this as a reference to the end-time gathering of the wicked around the city of Jerusalem (Ps. 2:2, 6; Dan. 11:45; Joel 3:12-14; Zech. 14:1-4; and the apocalyptic book of 1 Enoch 53:1). If this is a reference to the Day of the Lord, it likely speaks of the Valley of Jehoshaphat, which according to Jewish tradition is the part of the Kidron Valley between the Temple Mount and the Mount of Olives. This is where Joel prophesies that the judgment of nations will take place (Joel 3:12-14). Zechariah places the final battle on the outskirts of Jerusalem (Zech. 14:1-4).