Fort Knox Historic Site and the Penobscot Narrows Observatory
are both CLOSED for the 2022 season!

Fort Knox Historic Site and the Penobscot Narrows Bridge & Observatory is open from May 1st through October 31st (Closed November 1st through April 30th). The grounds are open daily during the offseason from 9am to sunset, weather depending. Pets are welcome everywhere (except in the Observatory) if on a 4'-6' leash, cleaned up after and not a nuisance to other guests. Pets are not allowed to be unattended in your vehicle. 

Call 207-469-6553 or email for information! 

The Friends of Fort Knox would like to thank everyone for their support as visitors, event attendees, and donors. It is with the help of each and everyone of you that we are able to operate, maintain and preserve the Fort Knox Historic Site for future generations!

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. Free interpretive guided tours of the fort are provided by volunteers, when available, between 11am to 3pm. The PNO 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

Reservations for special events (weddings, family gatherings, reunions, business retreats) and group tours may be arranged by calling 207-469-6553 or emailing You can also reach us on Facebook and Instagram.

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