Pule

Pule, also known as donkey cheese, is the world's most expensive cheese, selling for $600 or more per pound. It's only produced by one farm in the world, in the Zasavica Special Nature Reserve in Serbia, so you'll have to travel quite a distance to try it. Since the 1700s, the same recipe has been used to make Pule.

Three times a day, the donkeys must be milked by hand, and each milking yields little milk, less than a gallon per day from 15 animals. A pound of cheese necessitates more than three gallons of milk.

There are only 130 milk-producing jennies in the small herd. Donkey milk has 60 times the Vitamin C content of cow's milk but only 1% of the fat content. Cleopatra is said to have bathed in it because of its health and beauty benefits.

Pule has a soft, crumbly texture and a slightly sweet, nutty flavor that some compare to Spanish Manchego or Gruyere, but with a richer, more complex flavor. It's not widely available, but if you get the chance, try a bite of the world's most expensive cheese.

Price: Around $600 per pound, but on the open market, it can reach $1,300.