Sideling Hill Tunnel is a 6,782-foot former Pennsylvania Turnpike tunnel abandoned when the highway was rerouted in 1968. It is now part of the informal Pike2Bike route; reaching it requires hiking or cycling, and the interior is completely unlit, wet and rough, so visitors need lights and should use the established access points.
Filed under weird history: real events too strange to have made the textbook.
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Source: highways.dot.gov/highway-history/general-highway-history/back-time/abandoned-pennsylvania-turnpike