USA - Boston Light

Boston Light is a lighthouse located on Little Brewster Island in outer Boston Harbor, Massachusetts. The first lighthouse to be built on the site dates back to 1716, and was the first lighthouse to be built in what is now the United States. The current lighthouse dates from 1783, is the second oldest working lighthouse in the United States (after Sandy Hook Lighthouse in New Jersey), and is the only lighthouse to still be actively staffed by the United States Coast Guard, being automated in 1998 though there is still a keeper acting as tour guide. The structure was designated a National Historic Landmark in 1964

Year first constructed	1716
Year first lit	1783 (current tower)
Automated	1998
Deactivated	1776–1783 and during WWII.
Foundation	Granite Ledge
Construction	Masonry, Rubble Stone with brick lining
Tower shape	Conical
Markings / pattern	White with five steel bands and black trim
Height	89 feet (27 m)
Focal height	102 feet (31 m)
Original lens	Tallow candles installed in 1716
Current lens	2nd order Fresnel lens
Intensity	1,800,000 candlepower
Range	27 nautical miles (50 km; 31 mi)
Characteristic	Flashing white every 10 seconds.
Fog signal	HORN: 1 every 30s