The Nervión river (Basque: Nerbioi) waterfall in Spain runs through the city of Bilbao, Spain into the Cantabrian Sea (Bay of Biscay). Its lowermost course, downstream of its confluence with the Ibaizabal River, is known as the Estuary of Bilbao.
Cuevas del Drach are caves located near Porto Cristo in Mallorca, Spain. It contains one of the largest underground lakes in the world. Once you reach the underground lake (Lake Martel), you can see musicians on the boat playing classical music.