Tunnel du bois clair
The Tunnel du Bois Clair is a 1.6 km (0.99 mi) tunnel near Cluny, France. The tunnel is closed during the winter months (mid-October through the end of March) to protect a colony of bats that live in the tunnel. The tunnel takes about 7 minutes to travel through by bike and around 20 minutes by foot.
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References
Tunnel du Bois Clair Wikipedia(Text) CC BY-SA