Tulips in Holland - not just tulips. This is her symbol, and in the Middle Ages - even it was the method of payment of anything, and very expensive. For a couple of rare varieties of flower bulbs you can buy a house, or a sufficient number of livestock, or a small brewery. A girl with a dowry in the form of tulip bulbs was considered a wealthy bride. Today the cultivation of tulips - the main branch of the Dutch business. One fifth of the land area used for growing bulbs, which are then sent to 80 countries. The biggest flower market is located in the city of Aalsmeer, and the largest collection of tulips is the world famous royal park of flowers Keukenhof. The park has 4.5 million tulips planted 100 different varieties and it is open to visitors from mid of April to mid of May.