The Proof House, Commercial Road E1. This is where the Worshipful Company of Gunmakers tests shotguns and other small arms for safety.
"OK so we build this building then we wrap half of it in kitchen foil. . . ." London Bridge House, SE1.
The East London Mosque, Whitechapel Road E1.
A large number of Muslims live in London, particularly East London. I'm not a religious person myself, and I doubt that a religion that won't let men and women use the same door is likely to convert me.