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Nice. I also collect currency from countries I visit as well. More for souvenir than investment.

I also collected not for investment, I was just interested, I liked it and therefore I wanted to have them.
Some coins and paper money were stolen from me when I was still a teenager, they were very old from imperial times :-(((
I still have postage stamps (a lot). There is even a postage stamps of a country that is no longer.
There are 2 newspapers of 1913 and 1914.
And I have no idea if they have any value or not.
And there is also a small collection of semiprecious stones.