A vintage view of the central atrium area at Birmingham's BULL RING CENTRE. As one can see, the mall's interior was rather dark and dim, with no natural lighting. The idea was for brightly-lit stores to attract customers.
Photo from http://www.jlb2011.co.uk/iob/slides02/index.htm

The facade of the original BULL RING CENTRE, which incorporated design principles of 1950s-1970s Brutalism. The structure took on the appearance of a fortress-like, concrete hulk. 
Photo from Wikipedia / "Star One"