Photo by Corey Rich @Coreyrichproductions Koroška is an epicenter for mountain biking in Slovenia with more than 620 miles of established biking trails flowing through these cool fir forests and across open grassy fields. There’s even a biking trail that goes down into an old mine shaft that allows you to ride by headlamp almost a mile underground! Tjaša Gorenc and Jani Hercog (@ridgelinetrails) enjoy a descent on single track through the ferns.