I have a stash of about a dozen foreign currencies. That's small compared to what some here have collected, but it's more than anyone else in my family has collected in 50 years. In most cases the value per currency is small-- no more than a few USD each. I think the most I have "stranded" in any one currency is about £14 from the UK. I'm in no rush to exchange it. I keep the money as travel souvenirs. Even if I no longer appreciate them at some point, the kids or grandkids in my family might.