Amsterdam is always discussed when talking about popular destinations in the world. The airport alone is a good reason to hope for a layover there.
It hosts a branch of the Riijkmuseum where you can learn about Dutch art, literature and music and the airport also has a 6XD theater. In the theater you can take a film ride that's five minutes long and comes complete with special effects.
There is also a Back to Life oxygen bar. If you're not sure what that is it's a place where you can take in some oxygen that's infused with lavender and eucalyptus. If that doesn't help you relax for your upcoming flight nothing will.