Fort Knox is open!

The Penobscot Narrows Observatory is currently closed until June 1st


 The Fort Knox grounds are open all year round from 9 am till about sunset (varies in winter). The Friends of Fort Knox is pleased to announce we will open the Fort and restrooms to the public on Friday, May 8, 2020, at 9 am. Please do not visit if feeling ill, wash hands and practice social distancing. The Friends of Fort Knox wish wellness to you and your families as we get through these hard times. 


When on the grounds, Fort visitors must stay at least six feet away from other people who do not live in your household. If necessary, step aside when passing other people on walkways and remember that groups of 10 or more are prohibited. Avoid touching signs, kiosks, buildings and benches to minimize the potential spread of the virus. If you are sick, stay home: it puts others at risk when you leave home while exhibiting symptoms related to COVID-19 or if you have recently been exposed to the virus. 

Call 207-469-6553 or email for information!

The Fort Knox Historic Site features one of the best-preserved examples of coastal defense fortifications constructed in the mid-1800s.  It is America's first fort named after Major General Henry Knox. 

During the season (May 1st to October 31st: The Fort and Observatory are open from 9am to 6pm (7pm in July/August) unless otherwise posted at the gate. The grounds are open from 9am to sunset  Free interpretive guided tours provided by volunteers are available from 11am to 3pm.  Reservations for special events (weddings, family gatherings, reunions, business retreats) and group tours may be arranged by calling 207-469-6553 or


During the off season (November 1st to April 30th) Grounds are open from 9am to 4pm - weather dependent.

 The Penobscot Narrows Observatory is the tallest bridge observatory open to the public in the world.  Visitors to the observatory ride Maine's fastest elevator up 420' feet for breathtaking 360 degree views of the Penobscot Bay area.

Please enjoy the slideshow below for a taste of what Fort Knox and the PNO have to offer!


Phone: 207-469-6553

740 Fort Knox Road, Prospect, Maine 04981


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