Gråkallen
Gråkallen is a mountain in the Bymarka area of Trondheim Municipality in Trøndelag county, Norway. The tall mountain is located in the Byåsen part of the city of Trondheim.
The summit is covered by an abandoned fenced military installation. Below the summit there is a ski station accessible by bus from Trondheim. In the summer, the ski runs through the pine forests allow hiking and mountain biking back to the city below.