Have you tried searching Google ?
"octogon-shaped" buildings Ethiopia
Follow the road NNE from your POI to this:
Addendum: Could be a water-collecting tower !
Octogonal sail shown HERE
(So little do I know!)
Octogonal buildings on solitude hilltops in GE:
3.738069 , 38.581383
9.686681 . 35.238031
9.937601 , 35.136579
10.014027 , 35.212089
10.064739 , 35273628
9.02304 , 36.584729
9.045850, 38.694250 in Adis A.
REMEMBER: These coordinates can be copy/pasted into
Google Earth's "Search line" in upper left corner.
You then go straight to the Point of Interest
I know: This is not an answer to the question , sorry.
Ethiopian Christian music to go HERE