The Nantucket lightship set sail for Boston on Monday from...

The Nantucket lightship set sail for Boston on Monday from Oyster Bay Harbor to become an education center and museum. (May 9, 2010) Credit: Loretta Guglielmino

The Nantucket Lightship leaves port at Oyster Bay Harbor to become an education center and museum in Boston. (Photo by Loretta Guglielmino / May 9, 2010)

The Nantucket Lightship, moored for seven years in Oyster Bay Harbor looking for a permanent home, is expected to reach Boston Harbor today to become an education center and museum. 

The 73-year-old lightship, which yesterday left Oyster Bay Harbor, is the largest of a class of Coast Guard lightships that served as mobile lighthouses. The vessel was decommissioned in 1975 and designated a National Historic Landmark in 1989.

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