Posters about the countries represented
In our children's group. Capital, population, currency, language and national day. "Hello" in the different languages at the bottom.
The children were allowed to bring money from the country if they had any at home. We have previously made passports, and "flew" to these countries. With tickets, passport control, music from the country in question on the plane etc... Very fun to get to know where the children/parents are from :) (this was done with and by 4-year-olds)