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fas‧ci‧na‧tion
1 [singular, uncountable] the state of being very interested in something, so that you want to look at it, learn about it etc [↪ obsession]
2 [uncountable and countable] something that interests you very much, or the quality of being very interesting 
The fascination lay in the mystery of what was inside the box.
The fascination lay in the mystery of what was inside the box.