In Eastern Europe, there are different charges to get into attractions for tourists and locals.
The EU rules (Ha-Ha) state that this is illegal. Again.. Ha-Ha.
It still goes on in EU and non EU Eastern European countries. It's not a lot for the tourist to pay. For instance, the caves up near Chernobyl (Ukraine - non EU) are around €1 for locals and €3 for the tourists. Not much of a difference in real terms (a favourite government phrase), but a leap of 200% in reality.