Boston Fire of 1872. The Corner of Perkins and Pearl Streets

The Corner of Perkins and Pearl Streets, Looking to Broad Street
All these photos are great, KD. If really confusing.

We got the group pose again, plus another numbered rock (number 9 this time). What really stands out here though is behind them, the rock column with the names (which the engravings seem era appropriate). Assuming they were the tenants of the now destroyed building, you can see names going all the way up, getting covered by soot (or melted away by the heat). But what the heck is the rest of that stone archway supposed to be? The columns are funky and the rock formations sitting on top of it look very strange. Naturalistic, seeming more like Mayan ruins. What sort of structure was this exactly?