Vitamin D -- specifically the form D3 -- is the only vitamin your body makes itself. It's fat-soluble, which means your body stores vitamin D in its adipose tissue -- in its fat. And, if you want to be specific about things, this vitamin is actually a hormone.
Sullivan's Castle Island, South Boston, MA, Est. 1951. Castle Island. Located at the end of Carson Beach, on Pleasure Bay in South Boston, Castle Island is a 22-acre recreation site, and the site of Fort Independence. Castle Island was really an island until several land reclamations through the years extended causeways and eventually roadways.
Cape Ann is Massachusetts' other cape, less famous and much smaller than Cape Cod, but no less interesting. This promontory of land just 30 miles northeast of Boston includes the city of Gloucester and the towns of Rockport, Essex and Manchester-by-the-Sea.