Easiest list ever:

• Hogwarts, Hogsmeade, Diagon Alley, The Three Broomsticks,The Burrow...
• Narnia
• Westeros for obvious reasons
• PCA (Yes, judge me, PCA, and I wish I studied there :P)
• Neverland
• Wonderland
• Oz
• Springfield (I don't care if there are cities named Springfield, I'm talking about The Simpsons' Springfield)
• South Park
• Whoville haha
• Bikini Bottom
• Mt. Olympus
• Los Santos, but only if I was the badass
• Storybrooke, but again, only if I knew what the fudge was going on :P

Am I forgetting something? PS: Not putting any Dystopia for obvious reasons, besides most of them were places that already existed.