In Trollhättan, the Göta River takes a mighty leap, a spectacular sight that has attracted visitors to the town for centuries. The best spots for viewing these waterfalls include Kopparklinten, Nyckelbergeet, and Spikön Island. Trollhättan's Fallensdagar (Fall Days) is the best-known event in town and occurs during 3 days in July (dates vary annually). The Göta River and the waterfalls are celebrated in this nearly 40-year-old festival. Outdoor stages are used for entertainment and the town's pubs, restaurants, and clubs do a lively business. The Göta River has the highest flow of any Swedish river, and stretches for 90km (57 miles). The waterfalls at Trollhättan, with a drop of 31m (104 ft.), once were an obstacle difficult to overcome; however, they have since been harnessed. Today, tourists can see the water flow into the gorge at a rate of 90,000m per second, but only at certain times, such as Fall Days in July. A nearby attraction, about 2km south of town, is Kanalmuseet, Slussområdet, which lies at the top of a 104-foot "staircase" created by the locks. It tells the story of the Trollhättan Canal in pictures, models, and tools. An on-site cinema shows historic footage of the locks throughout their history. It is open only between June and August 20, daily from 11am to 7pm. Off season from noon to 5pm Saturday and Sunday. To reach it from the center of town, follow the signposts pointing to "Slussarna" ("The Locks"). One of the most exciting things to do is to take a walk along the falls. The promenade is called Schleusenpromenade, and a walk along this pathway will reveal ruins of the failed canals of the 18th century. In the Gamle Dal'n Park area, locks from the early and mid-19th century remain. Information boards tell of the huge obstacle the falls once presented before they were tamed, and how the unique industrial landscape visitors see today came about.