crna hora staircase of lookout tower, construction with metal steps

welded grate grille loads galvanized platform high resistance steel floor climbing route stainless aluminum plate industry technology empty escalator silver material metallic brushed shiny stair alloy building communication design frame sky lookout observation point tower staircase spiral metal construction steps watch ladder janske lazne cerna hora crna post place view landscape landmark tree mast vehicle steeple spire monument wind plant lighthouse electricity sculpture transport