Columbia University
Columbia University: Real Virtual: Representing Architectural Time and Space
An extensive collection of resources designed to aid the teaching of architectural history. An introduction to the period of architecture accompanies images. Viewers can manipulate the images to achieve a panoramic view or close-up of...
Other
Minisink Valley Hist. Soc.: Port Jervis & the Gilded Age
Although this site concerns itself primarily with Port Jervis, New York, it does gives us a good overview of the building boom America experienced in the Gilded Age.
Boston College
Boston College: 19th Century Skyscrapers
This site has many images of skyscrapers from the 19th Century made possible by steel technology.