I read these flowers aren't very rare in The Netherlands, but I saw them for the first time the other day in the forest.
They are grass lilies (Ornithogalum umbellatum), also known as star-of-Bethlehem, nap-at-noon, and some other funny names, having to with this flower's closing in the afternoon and in bad weather.
Olympus Stylus 1s, 42mm, ISO200, f5.6, 1/160s
Olympus Stylus 1s, 42mm, ISO200, f8, 1/100s
Olympus Stylus 1s, 42mm, ISO100, f5.6, 1/200s
Thanks for watching!