The Keweenaw's Cold War Sentinel

The Open Skies Project

Tucked deep in the Keweenaw woods, the Open Skies Project, a former Calumet Air Force Station, surprises first-time visitors with its scale—massive radar domes, Cold War history, and a hidden, open space in the forest. From the viewing platform atop Mount Horace Greeley, enjoy sweeping all-season views of Keweenaw forests, freshwater lakes, Mount Bohemia, and even distant Isle Royale. In fall, the landscape comes alive with crimson and gold, while every season offers its own unique beauty. Explore this hidden landmark where history meets the vast Keweenaw skies.

Explore the Open Skies Project

The Open Skies Project offers a unique experience for a variety of visitors:

• History Buffs: Cold War-era radar station, military buildings, and community remnants
• Outdoor Enthusiasts: Scenic hikes, mountaintop views, and all-season landscapes
• Photography Lovers: Panoramic vistas, radome towers, and hidden architectural gems
• Urban Explorers: Rare access to an off-the-beaten-path, historic military site
• Families & Educators: Engaging tours that blend history, nature, and storytelling

Seasonal Adventures at the Open Skies Project

No matter when you visit, the Open Skies Project offers something special each season:

• Spring (Mid–Late May): The site reopens after winter, wildflowers bloom, and the first hints of vibrant foliage appear.
• Summer: Lush forests, long daylight, and warm weather make it ideal for walking tours exploring the historic buildings and taking in sweeping views from the radome towers.
• Fall (September–Late October): Crimson and gold forests transform the landscape, offering breathtaking vistas and perfect conditions for photography and scenic tours. Check out the current fall conditions here!

The site is open mid-to-late May through late October, giving visitors plenty of opportunities to experience history, scenery, and a laid-back historic adventure.

Enhanced Visitor Experience at the Open Skies Project

Thanks to a $6,000 grant from Visit Keweenaw’s Destination Development Fund, the Open Skies Project has installed safety railings atop the radar tower at Mount Horace Greeley. This enhancement provides secure access to one of the Keweenaw’s most breathtaking panoramic views, allowing visitors to safely enjoy vistas of Lake Superior, Mount Bohemia, and the surrounding forests. The installation was carried out by the Open Skies Project team, furthering their mission to preserve and share this Cold War-era site.

This initiative is part of Visit Keweenaw’s broader efforts to support community-driven projects that enhance outdoor recreation and cultural heritage across Houghton and Keweenaw counties.