If you have a taste for major industrial sights or large water basins, and would like to get away from the crowds, hike a few kilometres up along the river Our, until you reach the Pumped Storage Plant. It has two large reservoirs and was recently expanded. The total reservoir capacity is about 10,800,000m³, making it the largest hydro-electric power plant in Europe. It has a visitors' centre, which allows a peek into its underground power plant. It's a pleasant walk, along the water, but uphill.