
Each day from Monday to Thursday between 4 and 6pm, the Royal Palace in Madrid sees a surge in visitors. Between those hours, EU citizens – as well as Latin Americans – are admitted free. The rest of us must pay €18 (£16).
This is just one of countless examples of price discrimination for tourist attractions around the world: how much you pay depends on where you live. From 14 January, it will cost non-EU citizens €10 more to visit the Louvre.