The Bible very clearly teaches a sobering message that hell does in fact exist and is a place of unimaginable torment.  No one has to go there, and no one goes for being bad - people only go there because they chose to reject God and His offer to pardon their offenses against Him and of eternal life in relationship with Him.

Rev 20:10-14

10And the devil, who deceived them, was thrown into the lake of burning sulfur, where the beast and the false prophet had been thrown. They will be tormented day and night for ever and ever. 11Then I saw a great white throne and him who was seated on it. Earth and sky fled from his presence, and there was no place for them. 12And I saw the dead, great and small, standing before the throne, and books were opened. Another book was opened, which is the book of life. The dead were judged according to what they had done as recorded in the books. 13The sea gave up the dead that were in it, and death and Hades gave up the dead that were in them, and each person was judged according to what he had done. 14Then death and Hades were thrown into the lake of fire. The lake of fire is the second death. 15 If anyone's name was not found written in the book of life, he was thrown into the lake of fire.

2 Thes. 1:8-9
8He will punish those who do not know God and do not obey the gospel of our Lord Jesus. 9They will be punished with everlasting destruction and shut out from the presence of the Lord and from the majesty of his power.

Matt. 25:41-46
"Then he will say to those on his left, 'Depart from me, you who are cursed, into the eternal fire prepared for the devil and his angels. 42For I was hungry and you gave me nothing to eat, I was thirsty and you gave me nothing to drink, 43I was a stranger and you did not invite me in, I needed clothes and you did not clothe me, I was sick and in prison and you did not look after me.' 44"They also will answer, 'Lord, when did we see you hungry or thirsty or a stranger or needing clothes or sick or in prison, and did not help you?' 45"He will reply, 'I tell you the truth, whatever you did not do for one of the least of these, you did not do for me.' 46"Then they will go away to eternal punishment, but the righteous to eternal life."

Luke 12:4-5
4"I tell you, my friends, do not be afraid of those who kill the body and after that can do no more. 5But I will show you whom you should fear: Fear him who, after the killing of the body, has power to throw you into hell. Yes, I tell you, fear him.  (Jesus speaking)

Luke 16:22-24
22"The time came when the beggar died and the angels carried him to Abraham's side. The rich man also died and was buried.23 In hell, where he was in torment, he looked up and saw Abraham far away, with Lazarus by his side. 24So he called to him, 'Father Abraham, have pity on me and send Lazarus to dip the tip of his finger in water and cool my tongue, because I am in agony in this fire.'  (Jesus speaking)

Revelation 14:9-11
9A third angel followed them and said in a loud voice: "If anyone worships the beast and his image and receives his mark on the forehead or on the hand, 10he, too, will drink of the wine of God's fury, which has been poured full strength into the cup of his wrath. He will be tormented with burning sulfur in the presence of the holy angels and of the Lamb. 11And the smoke of their torment rises for ever and ever. There is no rest day or night for those who worship the beast and his image, or for anyone who receives the mark of his name." Rev 14:9

First Person Account
Bill Weise describes a personal vision of hell that Jesus gave him to proclaim the reality of hell to our contemporary world.  Bill recounts this in his book "23 Minutes in Hell".  Here are some of his impressions, which remarkably also all have a supporting scriptural basis:

“The first thing I noticed was the temperature – it was hot – far beyond any possibility of sustaining life”

“I felt extremely weak” “I felt utterly panicked”

“But these creatures were not of this natural world, I recognized that they were entirely evil, and they were gazing at me with pure, unrestrained hatred, which completely paralyzed me with fear.”

“I wanted desperately to get up and run. But as I lay on the wretched cell floor, I noticed that I had absolutely no strength in my body. I could barely move. Why didn’t I have strength? I felt so defenseless. Psalm 88:4 says, ‘I am counted with them that go down into the pit: I am as a man that hath no strength (KJV)”.

“I was extremely nauseous from the terrible, foul stench coming from these creatures. It was absolutely disgusting, foul, and rotten. It was, by far, the most putrid smells I have ever encountered. If you could take every rotten thing you can imagine, such as an open sewer, rotten meat, spoiled eggs, sour milk, dead rotting animal flesh, and sulfur, and magnify it a thousand times, you might come close.”

“I was horrified as I heard the screams of an untold multitude of people crying out in torment. It was absolutely deafening. The terror-filled screams seemed to go right through me, penetrating my very being.”

“As I stood outside the cell, I actually felt the darkness”...”The darkness was not simply the absence of light – it had a distinctive evil presence, a feeling of death, a penetrating evil.”

“There were also gigantic rats and huge spiders at least three feet wide and two or three feet high. I also saw snakes and worms ranging from small to enormously large. I was petrified and I could not believe my eyes.”