Book excerpt: How does a landmark become, after just a few generations, a landfill? In Forgotten Philadelphia, Thomas Keels takes the reader through a lavishly illustrated journey through three centuries of Philadelphia's architecture: what was built, how the public perceived the value of certain buildings, and why those buildings were eventually demolished. Keels does not simply lament the loss of buildings. Instead, he argues that in some cases there were good reasons to demolish places like the Broad Street Station; while some people today see this as a loss on par with the destruction of New York's Penn Station, at the time its demolition was to many a symbolic liberation from political corruption. In writing that celebrates Philadelphia past without ever being sentimental, Keels describes a city that was always reinventing itself, filled with people who always had a very measured view of the worth and beauty of its public architecture