Best riddles for teens

What building has the most stories?

I may seem real yet I am not, Once you're gone I'm often forgot. Time here stretches and it shrinks, It all depends on how you think. I may be good, I may be bad, I may be the same as one you've had. What am I?

What kind of dog never bites?

To you, rude would I never be, Though I flag my tongue for all to see. What am I?

A man is found hanging in a room 30 feet off the ground. There is nothing else in the room except for a large puddle of water on the ground. The police can't see any way the man could have climbed the walls to get to where he is hanging. How did this man hang himself?

I have wings but I'm not a bird I am small and colorful. I live in gardens and fields and forests. I used to be a caterpillar. I am a...

Wash it and it isn't clean. Don't wash it and then it's clean. What I Am?

You saw me where I never was and where I could not be. And yet within that very place, my face you often see.

When is your uncle's sister not your aunt?

I am a five letter word and very strong. I become single when you remove two letters from me. What Am I?