A graveyard is an excellent place to learn symbolism. You can learn how the culture surrounding you perceives the concept of death and afterlife as well as how the historic transition of those concepts affects the design of gravestone.
If you are an alien, a gravestone is sort of the Arecibo Message on the earth...Well, at least for a foreigner like me.
I don't know why, I've been to this tower and taken pictures thinking about posting it here...at least 3 times. My attempts were never fulfilled. I am not even sure why I have been so mentally blocked about doing it. Along with Powderhouse, Prospect Hill Tower is easily one of the structures that represents the city of Somerville.
Looking through the list of places I made during the last few months, the first thing I wanted to cover was a house called the "Old Spite House" in Marblehead.