railroad bridge in green balkan mountains summer scenery bulgaria

varna valley vacation undefined trip travelling travel transportation transport track sunflowers summer skyline sky skies season scenic scenery rural route road river railway rails railroad plantation plant picturesque pasture pastoral panorama nature mountains mountain meadow line landscape karnobat industry horizon hill green grass forest fields field europe distance destination crossing countryside clear carriage cargo business bulgarian bulgaria balkans balkan agriculture waterway vehicle tree train overpass landmark bridge old construction