Penobscot Narrows Bridge and Observatory

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740 Fort Knox Rd
Stockton Springs, ME 04981
+1 (207) 469-6553
https://www.fortknoxmaine.com

The Fort Knox Historic Site and Penobscot Narrows Observatory are located in Prospect, Maine, and feature one of the most well-preserved examples of mid-19th century coastal defense fortifications. Visitors can explore America's original Fort Knox, named after Major General Henry Knox, and take in stunning 360-degree views of the Penobscot Bay area from the world’s tallest publicly accessible bridge observatory.

The site offers a range of amenities, including a gift shop and an educational museum center, and hosts various events throughout the season, such as Civil War Days. With the support of visitors and donors, the Friends of Fort Knox work to maintain and preserve this historic site for future generations.

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4.548 reviews
Photo of Frank P.
Frank P.
9/29/2025

Such a great stop! We didn't have time to visit the fort, but we very much enjoyed the bridge observatory. Not expensive at all, easy drive from site entrance to the bridge. Then a quick elevator...

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Cindy B.
8/14/2025

We stopped at the Penobscot Bridge on our way to Bar Harbor to go up to the observatory. It is really high (420 feet) and you get a great view of the surrounding area. There are maps on each side...

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Photo of Darryl S.
Darryl S.
8/4/2024

It was our second time to the Penobscot Narrows Bridge and Observatory, and it was like seeing it for the first time: Absolutely wonderful! So alive one feels at that height, with that...

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Joanna R.
11/10/2022

Beautiful location Engineering of this bridge and observatory is amazing and I believe it deserves to be stopped at and admired. Plenty of parking and information to read while you are there. If...

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Photo of Winny L.
Winny L.
3/20/2022

While in Maine, this is a nice attraction to visit. It was nice driving over the Penobscot Narrows Bridge and visit the Observatory. Penobscot Narrows Bridge opened in Dec 2006 and the Observatory...

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Fort Knox & Penobscot Narrows Observatory

Fort Knox and the Penobscot Narrows Observatory, located in Prospect, Maine, is a historic site showcasing one of the best-preserved examples of coastal defense fortifications built in the mid-1800s. Named after Major General Henry Knox, the site includes the tallest bridge observatory open to the public in the world, offering visitors stunning panoramic views of the Penobscot Bay area. Visitors can explore the fort's rich history, enjoy amenities such as a gift shop and educational museum center, and participate in special events like Civil War Days. The Friends of Fort Knox express gratitude to all supporters, enabling the preservation and maintenance of this iconic landmark for future generations. Generated from the website
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