From Airolo the route takes you through the Tremola Valley, where the namesake cobbled road winds through 37 hairpin bends over about 900 meters of elevation gain. It was built in 1830 as a commercial road for carriages. At that time the Tremola was a masterpiece of engineering, set in the sparse alpine landscape. At the San Gottardo Pass, the National Museum of the San Gottardo provides information about the hard struggle between man and nature, illustrating the construction and maintenance of the mountain passes and historical forms of transport. The San Gottardo Chapel, built between 1160 and 1176, is also worth a visit. Take advantage of your stop to refresh yourself at the restaurant before continuing down through the Urserntal. The Urserntal is one of the most majestic alpine valleys in Switzerland. The final part leads along the Reuss river from Hospental to Andermatt.