Visitors access the Observation Tower through Fort Knox Historic Site, a fort constructed of granite in 1844. A $5 admission fee grants visitors access to the fort and the Observation Tower, which is accessed via elevator.

With a 2,120 foot span over a plummeting gorge, the bridge itself is a sight to behold. One of only three cable-stayed bridges in the world with an observation tower, the Penobscot Narrows Bridge and Observatory replaced the 75-year-old Waldo Hancock suspension bridge in October of 2006. Since then, it has been a draw for tourists and Maine residents alike. The Observation Tower opened in May of 2007 and has quickly become one of the most popular Midcoast Maine attractions.

The breathtaking span of bridge and the tumbling river below are only a fraction of the beauty visible from the 420 foot high tower. The glass tower affords 360 degree views of surrounding locales that are rich in natural allure. Visitors to the Observation Tower can see up to 100 miles away, from the Camden Hills, where the mountains meet the sea, to Mount Katahdin, the highest mountain in Maine and terminus of the Appalachian Trail.

The Observation Tower is open from May through October, allowing visitors to revel in the fresh beauty of spring and summer and the vivid and romantic colors of Maine's fall foliage. This attraction is truly the gateway to Acadia National Park and all the splendor Midcoast Maine has to offer.