Pittsburgh’s Golden Triangle during the St. Patrick’s Day flood, 1936 [Pittsburgh Post-Gazette via Heinz History Center]
Pittsburgh’s Golden Triangle during the St. Patrick’s Day flood, 1936 [Pittsburgh Post-Gazette via Heinz History Center]

![Pittsburgh’s Golden Triangle, 1923 [Brookline Connection]](http://24.media.tumblr.com/tumblr_l7g8bsE4Hp1qakblyo1_500.jpg)
![Grandview Avenue on Mount Washington, 1890 [WQED]](http://24.media.tumblr.com/tumblr_lyslhyriP71qakblyo1_500.png)