Date of discovery: February 14, 2016
Location of discovery: Comet 67P/Churyumov–Gerasimenko
Source photo: http://www.esa.int/spaceinimages/Images/2016/01/Comet_on_18_December_2015_OSIRIS_narrow-angle_camera
Searching through the ESA index (European Space Agency) I had a hard time finding anything. After about twenty large photos, I finally found something that I thought would be interesting to you. An ancient structure built upon the comet. This looks like a foundation, but its not, its a structure with many sections. This area of the comet is about 3km across, so that would mean this structure above is about 250 meters across.
Scott C. Waring