urft dam urfttalsperre with urft lake at eifel national park in north rhine-westphalia, germany

architecture barrage construction dam destination eifel europe flora foliage germany green hiking hills holiday idyllic lake landscape leisure lookout lush national natural nature north outdoor outside park reservoir rhinewestphalia rur rursee scenery scenic spring storage summer tourism tourist tranquil travel traveling trekking urft urftstaumauer urftstausee urfttalsperre vacation valley viewpoint walking water