 The 52 @-@ foot ( 16 m ) tall Greens Ledge Light was completed in 1902 and serves as a typical example of a sparkplug lighthouse . Located in 10 feet ( 3 @.@ 0 m ) of water , the foundation flares out to support the deck the lighthouse is built on and includes a cavity for the lighthouse 's brick basement and cisterns . The four @-@ story structure of the lighthouse is assembled from five courses of curved iron plates . The interior is lined with brick to insulate and strengthen the tower and to " provid [ e ] an anchorage for the winding cast @-@ iron stairs which rise on the periphery of each story , " writes historian Dorothy Templeton . 
 The 52 @-@ foot ( 16 m ) tall Greens Ledge Light was completed in 1902 and <a href='uninflect' title='1'><mark>serves</mark></a> as a typical example of a sparkplug lighthouse . Located in 10 feet ( 3 @.@ 0 m ) of water , the foundation <a href='uninflect' title='2'><mark>flares</mark></a> out to support the deck the lighthouse is built on and <a href='uninflect' title='3'><mark>includes</mark></a> a cavity for the lighthouse <a href='null_genetive' title='4'><mark>'s</mark></a>brick basement and cisterns . The four @-@ story structure of the lighthouse is assembled from five courses of curved iron plates . The interior is lined with brick to insulate and strengthen the tower and to " provid [ e ] an anchorage for the winding cast @-@ iron stairs which rise on the periphery of each story , " <a href='uninflect' title='5'><mark>writes</mark></a> historian Dorothy Templeton . 
Da 52 @-@ foot ( 16 m ) tall Greens Ledge Light was completed in 1902 and serve as a typical example of a sparkplug lighthouse . Located in 10 feet ( 3 @.@ 0 m ) of water , the foundation flare out to support tdadeck thdaighthouse is built on and include a cavity fir the lighthouse  brick basement and cisterns . The four @-@ story structure of the lighthouse is assembled from five courses of curved iron plates . The interior is lined with brick to insulate and strengthen thedawer and to " provid [ e ] an anchorage for the winding cast @-@ iron stairs which rise on the periphery of each story , " write historian Dorothy Templeton .