To reach Fort Lisser by car,from Enego you go up to Tombal, just before Valmaron, and then take the road to the left with the indication "Strong Lisser". After a few kilometers you arrive at the "Lambara" resort, where there are some huts. From here a dirt road to the right leads to the top of Mount Lisser up to a few meters from the Fort.
The fort is also accessible by foot or bike to trails and forest roads.
More precisely, from Enego you walk the CAI 868 trail to Tombal and then continue with the CAI 865 trail to Mount Lisser, which is reached in about 3 hours' walk.
Alternatively, from the Tombal resort, leaving the car to the parking lot, you can reach the top of Fort Lisser with a walk of about an hour and a half, along the cai 865 path.
The Lisser can still be reached from Valmaron with a walk of about an hour climbing the meadows of the former ski slopes.