An interesting fact is that the most expensive cheese in the world is made by Zasavica from Serbia, 1 kg (2 lbs) of this cheese costs 1000 euros (1400 US dollars). This cheese is reportedly so expensive because it is made from donkey milk, and it takes 25 liters of milk for one kg of cheese. It doesn't look impressive, but when you find out that a donkey produces 25 liters of milk for a whole year, then you understand why this cheese is so expensive. Donkey milk is extremely valuable in the pharmaceutical industry because donkey milk has a beneficial effect on the skin, rejuvenating it. There is a legend that Cleopatra bathed once a week in donkey milk, and that is why her skin was beautiful.