What the Helen of Troy is This

What the Helen of Troy is This? (Reader Request)

“Dear PoP,

In my runs around DC, I see these obelisk at random locations – this one is at 15th and Deanfield NW – and I wonder their history. Was DC first settled by ancient Pharaohs or did Romans colonize it later, dragging obelisk here to show their mastery of a new land? And if one has an obelisk in their yard, does it have or transfer value? Can they be removed? Or do they really demarcate the touch points for the galactic spaceship that installed their larger version in the center of our Mall?

Thanks,
Wayan”

Some folks were disappointed with the previous Helen of Troy post (though I still think it was a fair question), anyway, what do you think this is – marking the property boundary? Anyone else seen these around?