For years I wanted to visit this site, which I thought was a giant boulder, but didn't know how to get there. Now it is a trail with parking at the end of Shattuck Street.
It's so much more than I expected! It is not one boulder but a whole series of rocks around the edges of a defunct quarry with views to the south (Mount Wachusett), west and north. The rocks are decorated with a wide variety of graffiti messages and designs, most of them clean.
There is also a tour run from time to time by the Boulder Art Cafe for three hours starting on Main Street, but being out of shape I went without them and it was an hour from the Shattuck lot.
Beware of broken glass in places. read more