clouds communications equipment dark darkening height high lighting tower lights platforms safety rails sports arena spot lights steel steel structure steps stormy stormy skies tower towering apartment architecture balcony building built construction exterior glass house old structure urban wall window crane elevator engineering equipment industrial industry iron machine machinery metal technology angles background beams curved elements England english girders Great Britain London modern rivets skyscraper strength strong structural struts symmetrical symmetry walkietalkie windows airport Balearic Islands ceiling majorca Mallorca palma roof Spain terminal communicating communications connecting highrise light multi-storey multi-story receivers receiving sending Signals telecommunications transmission transmissions transmitters transmitting abstract blue grunge metals oxide rust rusted rusting rusty texture wheathered green