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There are so many different types of museums, little eats, etc, that you can not see it all in one trip. It is an amazing place. Thanks @rogvalentin.

I agree. I still haven't been to the top of the tower... It was surrounded by cloud both times I had an opportunity, so I just checked out the shops. There was a crazy-length line for Zara...

The restaurant on top is also really good if you can afford it.