In a game where I spent countless hours killing demons, I found a delightful "special" area called Whimsydale in Diablo III. It was accessible via a magic portal from a Rainbow Treasure Goblin. I was completing bounties when I found him.
It had a lot of treasure in it. I had to make a lot of trips back to town to salvage the goods.
I also found a level that I'll tell you about, but you'll probably think I'm lying. It's the "Not the Cow Level". It was full of cows attacking me. It also had a lot of treasure.
I love this game...