Chatham Lighthouse, known as Twin Lights prior to 1923, is a lighthouse in Chatham, Massachusetts, near the "elbow" of Cape Cod. The original station, close to the shore, was built in 1808 with two wooden towers that were replaced in 1841 in spite of questions as to why a single tower would not be adequate. In 1877, two new towers, made of cast iron rings, replaced those. One of the towers was moved to the Eastham area and became Nauset Light in 1923.
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Official website http://www.chathaminfo.com/scenic-landmarks
Coordinates 41°40'17.055" N -69°56'59.578" E