Donner Summit Tunnel trail

Summit Tunnel Hike at the Rainbow Bridge overlook

For something unique, the 3.0 Summit Tunnel Hike at the Rainbow Bridge overlook takes you along petroglyphs (walls built by Chinese immigrant railroad workers in the mid-1800s) and into the creepy-yet-cool tunnels of the old railroad. From the trailhead, keep heading west and up the incline to visit the stone walls and through the underpass of the old railroad bed. Tunnel 7 and Tunnel 6 have a fair amount of graffiti, but make for great photos. Flashlights are recommended for the tunnel portion. http://www.7×7.com/hike-the-highest-five-donner-pass-hikes-1856860375.html

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Photo by GCP

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