I'm writing a semi-historical story about Frank Geyer, the detective who captured the serial killer H.H. Holmes. He lived in Philadelphia around 1900, and I'd love to toss in a couple details to really sell the authenticity of the setting. So, do any historians of the area happen to know any interesting particulars? They can be about city life, customs, transportation, major events, new technologies, rural areas surrounding the town, whichever.

I am of course doing my own research, but there's always the chance I might miss something great, so I appreciate any help!