Alien: Early Ridleygram of the Refinery

leading from

Ridleygrams

and 

Alien: Nostromo

Ridley Scott's sketch of the refinery , with towers perhaps loosely
inspired by the skyline of Oxford known as City of the Dreaming Spires.

(from Alien: The Archive, p82, upper background cleared up using 
Photoshop because the picture was printed overlaying another)

The skyline of Oxford known as City of the Dreaming Spires.next to
Ridley Scott's sketch of the refinery , with towers perhaps loosely inspired by
the Oxford skyline

 



The skyline of Oxford known as City of the Dreaming Spires.
 (source: http://university.which.co.uk/university-of-oxford-o33)