Marc-André Leclerc climbs alone, far from the limelight. On remote alpine faces, the free-spirited 23-year-old Canadian makes some of the boldest solo ascents in history. Yet, he draws scant attention. With no cameras, no rope, and...

Hidden among the glaciers on Axel Heiberg Island, high in the Arctic Circle, are mountain bike lines too incredible to ignore. Harsh temperatures, volatile weather and nine-month winters mean the area is normally devoid of human life. But...