One of the most beautiful parks in the world is Keukenhof, which is in the Dutch city of Lisse. Many people call Keukenhof the “garden of Europe,” and it’s only open to the public for a few weeks each year, from the middle of March to the middle of May. At this time, people on the road can enjoy the beauty of millions of growing plants, such as tulips, daffodils, and hyacinths.