In this past summer, I was lucky enough to discover and observe quite a few Hymenopteran species living in and around the old house in north Athens.
Giant resin bee, Megachile sculpturalis (Hymenoptera: Megachilidae) Found at the back of the house.
Mason wasp, Parancistrocerus fulvipes. Found on the outlet on the patio.
Mason wasp Eumenes fraternus (suspected). Found outside my lab.