Rounding out the Manhattan thing.
Here are some snaps of New York architecture, taken over the years.
Guggenheim Museum, Fifth Avenue
Old and new
MoMA
SoHo
Park Avenue
The Look building reflected in the Helmsley Palace
Sixth Avenue
A fine primer on architectural style is How to Read Buildings – if you want to regale friends with the differences between an architrave and a muntin, this one is for you.
Here’s another worth checking out if Art Deco is your thing: