That (those) monolith (s)

I'd be quite happy if it's a gateway to another planet and over time aliens have come amongst us with a mission to destroy humanity.
As it is I expect it to be some rednecks with too much time on their hands.
 
There’s one outside Wythenshawe Hospital, just near the bus stops, it has no commemorative plaque but is very prominent.

Anyone have any idea what it is?
 

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