Fort Knox State Historic Site
Under $25A granite 1800s fort on the Penobscot River, paired with an elevator ride up the Penobscot Narrows Bridge observatory.

Photo: Quintin Soloviev, CC BY 4.0, via Wikimedia Commons. Cropped and resized.
Penobscot Narrows Bridge and Observatory is a sightseeing stop in Prospect, ME. Cost: under $25. Open May 1 through October 31.
711 Fort Knox Rd · Prospect, ME
The Penobscot Narrows Observatory sits atop the west tower of a cable-stayed bridge that opened in 2006, the first bridge observation tower in the United States. An elevator, billed as the tallest and fastest in Maine, lifts you to enclosed decks 447 feet above the river. On clear days you can see more than 40 miles over Penobscot Bay, and admission pairs with neighboring Fort Knox State Historic Site.
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