The Quincy Quarries were first opened in 1825 to supply granite for the Bunker Hill Monument in Boston’s historic Charlestown neighborhood and was actively mined to one degree or another until 1963. Once abandoned, the Quarries slowly flooded and became a popular — if dangerous — site for cliff jumping. A number of people began to die jumping into the flooded pits, so in order to curb the practice, a number of wooden pylons were placed sticking out of the water. However, these eventually sank below the waterline, becoming invisible, and deadly. The death toll went through the roof.

After being closed to the public for a number of years, the site was reopened in the 1980s after dirt from Boston’s “Big Dig” was used to fill in the pits. Now, Quincy Quarries is linked to the Blue Hill Reservation trail system and is open to the public. It has become very popular for its spectacular array of graffiti art, rock climbing, and views of downtown Boston. 
I left the house at 5 am so I could arrive at the quarry before it was overrun with people and so I could still beat the traffic into Boston for work. Unfortunately, this did not leave time for any climbing which would have produced more interesting photos.  I will simply have to make another visit.