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Hi Diego Rosa,

now I went through the "Keys to the Chalcidoidea of Czechoslovakia" by Peck, Boucek and Hoffer (1964).
The reddish base of antennal funicle could give an indication for L. gigas. Please don't take this as an ID, there might be also other species with this character, I'm not familiar enough with this taxon to exclude other possibilities.
The ground looks quite interesting, it COULD show a nest of Megachile parietina, or M. sicula, which is a recorded/potential hosts for L. gigas.
But, as mentioned: this is of course rather speculation, but maybe you'll remember more details of the spot, where you have taken the picture.

Marc