The world-famous serpentine road on the left slope of the Val Tremola was created with the construction of the Gotthard pass road. In the most spectacular section, the road climbs 300 meters in altitude over a length of four kilometers in 24 hairpin bends, which even have their own names. The pass road between Göschenen and Airolo was built between 1827 and 1832 according to plans by the Ticino engineer Francesco Meschini, after the access roads from Basel and Chiasso had been continuously expanded since the 1810s.
Today, the Tremolastrasse is largely in the same condition as when it was reconstructed in 1951. The road, which is six to seven meters wide, is bordered and supported by walls that are up to eight meters high. Some of the old dry stone walls are still there. The paving with granite stones is largely preserved, as are the kilometer stones. The two road attendant houses have disappeared. The first stood at the beginning of Tremolastrasse until it was destroyed in 1989. The second was higher up, below Voltone. Destroyed by an avalanche in 1874, it was not rebuilt in 1882 due to the approaching opening of the Gotthard railway