abandoned activities activity aquatics architecture architectures area areas baldeneysee carl-funke closed coal colliery culture cultures day daylight daytime deutschland district disused essen essen-heisingen essener europe festival former germany head history in incidental industrial industries industry lake lakes mine mines mining north of out out-of-service outdoors outside people pit plant plants recreational regatta regattas region rhine-westphalia ruhr ruhrgebiet sail sailboat sailboats sailing sails segelwoche service shaft shafthead sport sports tower towers water waters winding