The Penobscot Narrows Bridge in #Maine is home to the highest bridge observatory in the world.  

Fort Knox was the first fort built in Maine to be built entirely of granite and was built between 1844-1869. The site was designated a National Historic Landmark as an example of mid-19th century granite coastal fortification. It is considered one of the best preserved and most accessible forts in the U.S. https://fineartamerica.com/featured/penobscot-narrows-bridge-and-fort-knox-karen-cook.html #travel #bridge #Engineering #landmark

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