Three years ago I found an interesting website: eurobilltracker.com . It's a site where you copy the numbers of your bills to know where they were before you got them, and to follow where they'll go.
I quickly got addict to that game! :-)
I also have become one of the moderator of the EBT forum...
Since I'm living in Canada, I can't no longer track euros... but I track my Canadian dollars (whereswilly.com) ! :-))
I know it's a weird hobby but I like it...
Do you know these sites?