Most of the photos on this site were extracted from reference images (high-resolution tiffs, 20 to 200 megabytes in size) from the Library of Congress research archive. (To query the database click here.) Many were digitized by LOC contractors using a Sinar studio back. They are adjusted by your webmaster for contrast and color in Photoshop before being downsized and turned into the jpegs you see here.
The Hotel Pontchartrain in Detroit, seen earlier today around 1907 in this post. Now it's circa 1910-1915 and it has a few extra floors trimmed Second Empire style to look like a giant mansard roof. Not too many years later it was torn down to make way for a bank. Detroit Publishing glass negative. View full size.