What am I riddles

I have lot of memories, but I own nothing. What am I?

I can fly but I have no wings. I can cry but I have no eyes. Wherever I go, darkness follows me. What am I?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

This is as light as a feather, yet no man can hold it for long. What am I?

When you have me, you feel like sharing me. But, if you do share me, you don't have me. What am i?

I had no father, only a grandfather. I shall bear no sons, only daughters. What am I?

Everyone has me but nobody can lose me. What am I?

I visit you every night even if you don't call me. I'm lost every day. What Am I?

I have keys but no locks. I have a space but no room. You can enter, but can't go outside. What am I?

I have no life, but I can die, what am I?