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.
Castle Island is located on Day Boulevard in South Boston on the shore of Boston Harbor. It has been the site of a fortification since 1634. Castle Island was connected to the mainland by a narrow strip of land in 1928 and is thus no longer an island. It is currently a 22-acre (8.9 ha) recreation site and the location of Fort Independence.