The place where virtually every single person in existence will inevitably end up some day. According to a vast number of religions, if you don't follow the correct one (more specifically theirs), you will go to hell. If you don't follow the head deity's/deities' orders or wishes, you will go to hell. If you sin, even in the slightest way, you will go to tell. Therefore, anybody who does not follow every single religion to have ever existed simultaneously and sometimes makes a mistake in their life will end up in hell. This can include a devoted Christian who skips out on church once or twice a year, an atheist who slaughters babies, or a Muslim who doesn't pray five times a day.
Hitler is going to Hell for causing the deaths of so many people, even in the name of religion, but so is the nice old lady down the street from me because she made a bad decision years ago and stole a few drinks.