The Winepress

The scariest event in the calendar of Jesus's second coming - the winepress of the wrath of God.

The place
I will gather all the nations and bring them down to the Valley of Jehoshaphat. And I will enter into judgment with them there, on behalf of my people and my heritage Israel, because they have scattered them among the nations and have divided up my land, and have cast lots for my people, and have traded a boy for a prostitute, and have sold a girl for wine and have drunk it. (Joel 3:2-3 ESV)
Let the nations stir themselves up and come up to the Valley of Jehoshaphat; for there I will sit to judge all the surrounding nations. (Joel 3:12 ESV)
"When the Son of Man comes in his glory, and all the angels with him, then he will sit on his glorious throne. Before him will be gathered all the nations, and he will separate people one from another as a shepherd separates the sheep from the goats. And he will place the sheep on his right, but the goats on the left. (Matthew 25:31-33 ESV)
I tell you, in that night there will be two in one bed. One will be taken and the other left. There will be two women grinding together. One will be taken and the other left." And they said to him, "Where, Lord?" He said to them, "Where the corpse is, there the vultures will gather." (Luke 17:34-37 ESV)

The harvest
Put in the sickle, for the harvest is ripe. Go in, tread, for the winepress is full. The vats overflow, for their evil is great. (Joel 3:13 ESV)
Then I looked, and behold, a white cloud, and seated on the cloud one like a son of man, with a golden crown on his head, and a sharp sickle in his hand. And another angel came out of the temple, calling with a loud voice to him who sat on the cloud, "Put in your sickle, and reap, for the hour to reap has come, for the harvest of the earth is fully ripe." So he who sat on the cloud swung his sickle across the earth, and the earth was reaped.
Then another angel came out of the temple in heaven, and he too had a sharp sickle. And another angel came out from the altar, the angel who has authority over the fire, and he called with a loud voice to the one who had the sharp sickle, "Put in your sickle and gather the clusters from the vine of the earth, for its grapes are ripe." So the angel swung his sickle across the earth and gathered the grape harvest of the earth and threw it into the great winepress of the wrath of God. (Revelation 14:14-19 ESV)

The winepress
From his mouth comes a sharp sword with which to strike down the nations, and he will rule them with a rod of iron. He will tread the winepress of the fury of the wrath of God the Almighty. (Revelation 19:15 ESV)
I trampled the winepress alone, and no one from the nations was with Me. I trampled them in My anger and ground them underfoot in My fury; their blood spattered My garments, and all My clothes were stained. (Isaiah 63:3 HCSB)
And the winepress was trodden outside the city, and blood flowed from the winepress, as high as a horse’s bridle, for 1,600 stadia. (Revelation 14:20 ESV)

See Judgement.