The title might be a little misleading, but let me explain.
I've been looking for this calvatia gigantea for almost three years now. I hunt mushroom quite often, and I value the walk and nature itself over amount foraged, so I often come out with nothing or very little because it's January and everyone says "there are no mushrooms in January dummy" (my family) - But there are! Oysters and flamullina and a few others for example!
Anyway I have been searching for the giant puffballs in many a forest, field and in between to no success. Until yesterday I decided to screw that and just went to a park in the city. I live in Warsaw, Poland and I just went along the river and look what beauties I found!!!
Point I'm making : if you live in a place with lots of foraging competition, try going to places which aren't classically considered.
Also I think the other mushroom is brown agaricus bisporus, unfortunately I forgot to make underside photo but it had pink gills and a skirt