silhouette of the headgear of an old coal mine against a blue sky with setting sun

tower mast vehicle blue electricity landmark machine wind industry transport sky building skyscraper construction iron windmill shaft headframe head frame headgear old gallows winding hoist pit shafthead headstock poppethead cola genk belgium coal-mining complex sunny winterslag infrastucture heritage history historical coal mining steel elevator silhouette setting sun sunset sunrise evening morning dusk dawn