Marks and Sparks is not a tourist attraction, but it is often mentioned here because it is very good for takeaway food.
I do a lot of my food shopping there.
Personally, I can't imagine any shop as a tourist attraction.

Miss P,
How about Harrods, that must be the biggest shop tourist attraction anywhere, what do you think?

Muck

My reaction is "Don't they have shops in Wherever?"