South Dakota has some of the most unique and must-visit tunnels in the country, thanks – in part – to such innovative passages as the Needles Eye, Hood, and Scovel Johnson Tunnels. In addition to these more one-of-a-kind channels, South Dakota is also home to more traditional structures, like the one along the George S. Mickelson Trail:

Located in the Black Hills, the George S. Mickelson Trail is a 109-mile-long stretch that follows the same route as an old railroad branch line constructed by the Chicago, Burlington, and Quincy Railroad.
TripAdvisor/Deanne A
Named for the late Governor George S. Mickelson, the Trail was completed in 1998 and features a whopping 15 different trailheads, making it one of the most popular paths in the Mount Rushmore State!
TripAdvisor/jawsco
Beginning in Deadwood and ending near Edgemont, the George S. Mickelson Trail is a must-see for not only the surrounding Black Hills beauty but for its 100 converted railroad bridges and 4 rock tunnels, one of which spans 40 feet. 
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Situated just south of Mystic, the long and famous tunnel was the result of blasted rock and walls lined with specially-made beams that fit its curves and give it its distinct keyhole appearance. 
TripAdvisor/Cancunkids

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Whether you walk, jog, sprint, or ride your bike, you are guaranteed an unforgettable experience along the George S. Mickelson Trail! 
TripAdvisor/trip_haz_consultant
In addition to its tunnels, the Trail connects several of South Dakota's favorite towns and attractions to one another, including Custer, Hill City, Lead, and more. 
Flickr/Rails-to-Trails Conservancy
As if you needed a reason to visit, the George S. Mickelson Trail is also the setting for several special events, which can be found on the South Dakota Game, Fish, and Parks' website.
AllTrails/Dennis Burns
The George S. Mickelson Trail is open year-round from dawn to dusk, with showers, flush toilets, and other water systems open from May 1st through September 30th. 
AllTrails/Tim Spurgeon

For even more of our favorite SoDak trails, check out The 10 Gorgeous Hikes Everyone In South Dakota Must Complete.

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George S. Mickelson Trail, Deadwood, SD, USA