A couple wearing face masks take pictures at the world-famous Keukenhof garden in Lisse, Netherlands, Friday, April 9, 2021. Finally, after month after bleak month of lockdown, there are springtime shoots of hope emerging for a relaxation of coronavirus restrictions at a Dutch flower garden and other public venues. Keukenhof nestled in the pancake flat bulb fields between Amsterdam and The Hague opened its gates Friday to a lucky 5,000 people who were allowed in only if they could show proof on a smartphone app that they had just tested negative for COVID-19. (AP Photo/Peter Dejong)

Far fewer visitors than normal are seen at the world-famous Keukenhof garden in Lisse, Netherlands, Friday, April 9, 2021. Finally, after month after bleak month of lockdown, there are springtime shoots of hope emerging for a relaxation of coronavirus restrictions at a Dutch flower garden and other public venues. Keukenhof nestled in the pancake flat bulb fields between Amsterdam and The Hague opened its gates Friday to a lucky 5,000 people who were allowed in only if they could show proof on a smartphone app that they had just tested negative for COVID-19. (AP Photo/Peter Dejong)

Far fewer visitors than normal are seen at the world-famous Keukenhof garden in Lisse, Netherlands, Friday, April 9, 2021. Finally, after month after bleak month of lockdown, there are springtime shoots of hope emerging for a relaxation of coronavirus restrictions at a Dutch flower garden and other public venues. Keukenhof nestled in the pancake flat bulb fields between Amsterdam and The Hague opened its gates Friday to a lucky 5,000 people who were allowed in only if they could show proof on a smartphone app that they had just tested negative for COVID-19. (AP Photo/Peter Dejong)

Far fewer visitors than normal are seen at the world-famous Keukenhof garden in Lisse, Netherlands, Friday, April 9, 2021. Finally, after month after bleak month of lockdown, there are springtime shoots of hope emerging for a relaxation of coronavirus restrictions at a Dutch flower garden and other public venues. Keukenhof nestled in the pancake flat bulb fields between Amsterdam and The Hague opened its gates Friday to a lucky 5,000 people who were allowed in only if they could show proof on a smartphone app that they had just tested negative for COVID-19. (AP Photo/Peter Dejong)

Far fewer visitors than normal are seen at the world-famous Keukenhof garden in Lisse, Netherlands, Friday, April 9, 2021. Finally, after month after bleak month of lockdown, there are springtime shoots of hope emerging for a relaxation of coronavirus restrictions at a Dutch flower garden and other public venues. Keukenhof nestled in the pancake flat bulb fields between Amsterdam and The Hague opened its gates Friday to a lucky 5,000 people who were allowed in only if they could show proof on a smartphone app that they had just tested negative for COVID-19. (AP Photo/Peter Dejong)

Far fewer visitors than normal are seen at the world-famous Keukenhof garden in Lisse, Netherlands, Friday, April 9, 2021. Finally, after month after bleak month of lockdown, there are springtime shoots of hope emerging for a relaxation of coronavirus restrictions at a Dutch flower garden and other public venues. Keukenhof nestled in the pancake flat bulb fields between Amsterdam and The Hague opened its gates Friday to a lucky 5,000 people who were allowed in only if they could show proof on a smartphone app that they had just tested negative for COVID-19. (AP Photo/Peter Dejong)

Far fewer visitors than normal are seen at the world-famous Keukenhof garden in Lisse, Netherlands, Friday, April 9, 2021. Finally, after month after bleak month of lockdown, there are springtime shoots of hope emerging for a relaxation of coronavirus restrictions at a Dutch flower garden and other public venues. Keukenhof nestled in the pancake flat bulb fields between Amsterdam and The Hague opened its gates Friday to a lucky 5,000 people who were allowed in only if they could show proof on a smartphone app that they had just tested negative for COVID-19. (AP Photo/Peter Dejong)

Two women take pictures as far fewer visitors than normal are seen at the world-famous Keukenhof garden in Lisse, Netherlands, Friday, April 9, 2021. Finally, after month after bleak month of lockdown, there are springtime shoots of hope emerging for a relaxation of coronavirus restrictions at a Dutch flower garden and other public venues. Keukenhof nestled in the pancake flat bulb fields between Amsterdam and The Hague opened its gates Friday to a lucky 5,000 people who were allowed in only if they could show proof on a smartphone app that they had just tested negative for COVID-19. (AP Photo/Peter Dejong)