Fort Knox and the Penobscot Narrows Observatory
is closed for the Season!

Fort Knox Historic Site’s grounds continue to be open.

The gate opens at 9 am (weather dependent) and closes at sunset.

.Please pay entrance fees at the Iron Ranger, just next to the Gate Booth

Please do not park in front of the gate.

Restrooms are closed for the season, but privies are open down on the South side of the fort.

Visitor Center & Gift Shop open by appointment or chance.

We look forward to welcoming you back

May 1st, 2025

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. 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.

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

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Download your FREE Fort Knox Historic Site app!

“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 every one of you that we are able to operate, maintain and preserve the Fort Knox Historic Site for future generations!”

Fort Knox Historic Site &
Penobscot Narrows Bridge & Observatory

Discover America's Original Fort Knox - Prospect, Maine

Fort Knox and the Penobscot Narrows Observatory
is closed for the Season!

“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 every one of you that we are able to operate, maintain and preserve the Fort Knox Historic Site for future generations!”

Fort Knox Historic Site & Penobscot Narrows Bridge & Observatory

Fort Knox and the Penobscot Narrows Observatory is closed for the Season!

“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 every one of you that we are able to operate, maintain and preserve the Fort Knox Historic Site for future generations!”

Fort Knox Historic Site &
Penobscot Narrows Bridge & Observatory

Fort Knox and the Penobscot Narrows Observatory
is closed for the Season!