The following link will get you to the website mainted by a guy who does historiacl work. You can find churches, bulidings, anything you want. Try looking, only plan a long time!
Buffalo Architecture and History
St. Andrew's (I am biased; I love this church... used to be incredibly so traditional)
If I listed every item I love, It would take pages. Look up all the city buildings, the catherdrals, the parks - botanical gardens, etc., the parkway system, the Guaranty Building, Ellicott Square......... it goes on forever. Check the Darwin Martin house (there are 5 Wright honmes in Buffalo). For people moving here, look up the neighborhoods tab.
Enjoy!