[baremetal]

I am under the impression that pretty much anywhere in the developing world USD will spend. Maybe not in the west, but places that have a weak currency like africa, the middle east, and south america.

Here are a few cherry picked examples

https://www.reuters.com/world/americas/half-payments-caracas...

https://www.tripadvisor.com/ShowTopic-g293974-i368-k4798488-...

https://www.voanews.com/a/lebanon-leans-on-us-dollar-to-cope...

[Symbiote]

The Turkey example says dollars are not generally accepted, although they are easily changed.

[roflyear]

And if there is a bank there you'll be able to convert your currency.