Ed. Note: It’s the AirPhotosLive imaging balloon! Our last sighting was June 2021. Lots of info, and the super sweet view it sees, here.
“Dear PoPville,
Working from Rosslyn today, and it looks like a balloon has been moored over the mall. Any info? You can see them taking it down as of 9:40am in the second picture where it is at a lower altitude.”
And thanks to Mathew for sending a couple photos he took:
