If you're interested in the history of Boston and America, and particularly if you are a Revolutionary War buff, the Boston 1775 blog is a must-read. The level of detail that J.L. Bell provides is amazing, and many posts are filled with first-hand accounts pulled from diaries and historical documents.
I'm fortunate enough to have some guest posts on Boston 1775 in the coming days on the skirmishes that occurred between the patriots and the British on Little Brewster Island, home to Boston Light, a very strategic target. Here's the first post and look for more in the coming days.