Check out this great series of photos showing Boston in the late 1850s and early 1860s. Click on them to see greater details. They're pretty amazing.
View from grounds of the State House on Beacon Hil. Ticknor House on left, Boston Common to right.
Source: Boston Public Library Here is the same view down Tremont St. today on Google Maps. In the above image, you can see the pillars of King's Chapel and the Park Street Church off in the distance.
Tremont Street looking south from School Street and King's Chapel. Park Street Church is to the right.