Did you know the world's most expensive cheese comes from donkey's milk? A woman milks a donkey at a farm in Zasavica Resort, some 80 km (50 miles) west of Belgrade, Serbia. Zasavica, one of Serbia's famous natural reserves, will be producing donkey cheese at 1,000 euros ($1,272) per kilogram, the most expensive cheese in the world, according to the reserve. The reserve will also produce donkey milk, which is said to have been a beauty secret of Cleopatra's.