March 21–May 10 in Lisse, Netherlands, less than an hour outside Amsterdam, Keukenhof Gardens shows off nearly 80 acres of tulips, daffodils, and hyacinths—check the website for what’s in bloom and when. Hilltop trails above the plots offer views and photo ops of the splendor. Other attractions include an indoor pavilion with petal-themed art and more flowers plus tours of the grounds via bike or canal barge.