This plaque is embedded in the sidewalk on the Tremont Street side of the Parker House. It's easy to miss - who looks down while walking down that particularly busy sidewalk? - but once you see it, you just know you have to stop and take a look.
And for years, your view was, in fact, of Old North Church, just to the left of City Hall. But now, well, look at what Aaron Helfand saw this morning when he stood on the plaque and looked out: