Keukenhof.  Lisse, The Netherlands.

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April showers, May flowers
April showers, May flowers
Controversy in the garden, 1882
Controversy in the garden, 1882
Plant hunters
Plant hunters
Tulipmania
Tulipmania

"Keukenhof, the best day out among the flowers! There are more than 7 million bulbs in bloom this spring, with a total of 800 varieties of tulips. An unique and unforgettable experience!" Source: Keukenhof Official Site.