The Airborne Tulip memorials
It's all in Dutch though ... but you'll get what it's about
Extra bit of info:
And there's this ... (not trying to invite you to spend your money) but it adds some info: https://www.gofundme.com/f/the-arnhem-boys-tulip-memorial
fun fact "'Poppies' appear to be family of the tulips" - or maybe vice versa ... lol