 The 52 @-@ foot ( 16 m ) tall Greens Ledge Light was completed in 1902 and serves as a typical example of a <unk> 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 <unk> and strengthen the tower and to " <unk> [ e ] an anchorage for the winding cast @-@ iron stairs which rise on the periphery of each story , " writes historian Dorothy <unk> . 
