Bald-faced Hornet (Dolichovespula maculata) nests in Green-Wood are being revealed by the falling leaves. I’ve walked under these all summer without noticing them.
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This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.
Backyard and Beyond 
Scary, now to get me to look around here.
They nests are abandoned after the first frost if not before. They don’t get used again next year–they’re usually mauled to oblivion by winter weather.
As long as you’re not in their face, they have no interest in humans. For all the nests of Bald-faced Hornets, I don’t see that many of the wasps themselves during the summer.
Great to know.
Nature’s 3D printers.
Cool!