Nov 1776
The island got its name from the fact that every fort located here was always informally known as "The Castle."
Quickly appreciated for its strategic location for the protection of Boston from sea attack, the first fortification on Castle Island was an earthwork and three cannon ordered in 1634 by Governor Dudley of Massachusetts Bay Colony.
After the evacuating British destroyed the islandˆs fortifications 1776, the fort was repaired by troops under the command of Lt. Paul Revere.
The present five pointed granite structure is the eighth fort to occupy this site and contains over 172,687 linear feet of hammered stone and was constructed under the direction of Colonel Sylvanus Thayer between 1834 and 1851.