Hallerbos (Flemish) or Bois de Halle (French) is a beech forest just south of Brussels. It's a popular spot for walking, cycling and horseback-riding.
Every spring, for a few short weeks, the forest makes a magical transformation into a blue carpeted wonderland. Millions of tiny bluebell flowers bloom under the shade of the beech trees and people flock to the forest to catch a glimpse.
Timing is everything, too soon and the bluebells aren't out yet; too late and you've missed the show for another year. But that's what makes seeing it so special.