Given that the present discussions are future-oriented (Z mount), I'll talk about passé, obsolete, has been stuff, just to keep balance.
In a recent post, Akira showed us the provisional garden in Ginza, replacing the demolished Sony building. What attracted me was the (comparatively modest) Fujiya building visible on his shots, at the bottom of which that fantastic Nikon second hand shop is located. Small shop, large choice.
I visited Tokyo twice and went there twice, getting a 500/8N and a 180/2.8 AIS ED.
Mirror tele lenses are fun but not really useful, as getting a sharp shot is really difficult. Full of Tokyo memories (got the blues, honestly), the 500/8 N was my walkaround lens today. All shots f/8.0 (ha ha).
Paris, champ de mars, école militaire. It has got real bells ringing.