At a first rapid glance, this spectacular photo seems to depict a military cemetery, but it's probably simply a manufacturer's storage yard.
I found this image on the following website:
Now, it's my sister Anne who might not feel happy about the choice of this date, because it's her birthday. Be that as it may, the organizers of this celebration (?) have chosen the above photo to highlight the fact that—as they point out on their website—"the water and sanitation crisis has claimed more lives than all the wars of the 20th century". And this is no laughing matter… although they might have invented a more solemn name for their day. On the other hand, their chosen name and their photo certainly attract attention.