Architectural Guide to Southern Minnesota Houses

A multimedia tour of Chicago and New York City ca. 1870-1930
Produced by the University of Birmingham and the University of Nottingham
Features maps, photographs, text, and music.

The Mining Co. Urban, Retail, and Transportation Geography Page
A collection of short, informative essays on various topics with links for further information

A Tour of the Fabulous Ruins of Detroit:  http://www.bhere.com/ruins/home.htm
An art web site by by Lowell Boileau displaying the architectural and community tragedy of deindustrialization and white flight.  Sample images reproduced below:

Boston Streets:
A multi-media historical geography of Boston

Tours of different New York Neighborhoods
Brooklyn College Area
New York Overview
Greenwich Village
The Lower East Side
Jackson Heights
Harlem

Resources: 

Guide to Local Architecture by Anna Claussen