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Visit the Portland Observatory
MAINE
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Portland Observatory
The Portland Observatory, built in 1807 at Portland, Maine, is the last surviving maritime signal tower in the United States. Using both a telescope and signal flags, two-way communication between ship and shore was possible several hours before an incoming vessel reached the docks.
This description uses material from the Wikipedia article on Portland Observatory and is licensed under the Creative Commons Attribution-ShareAlike License (view authors).
