IO! Magikalia Amsterdam!

My husband and I will be visiting Amsterdam this April/May. I was wondering if there were any places one would suggest as a 'must see' that would be of interest to those who are magickally inclined or into darker things in nature.

I am having trouble finding any destinations that aren't touristy and off the beaten path. Any suggestions would be most appreciated!

Places to go?
Things to see?
Occult shops?