Tower Bridge London UK drone,aerial view over river Thames

tower bridge london iconic landmark victorian engineering suspension bridge river thames bascule bridge historical structure pedestrian walkways glass floor engine rooms victorian architecture drawbridge mechanism cultural heritage tourist attraction cityscape panoramic views thames crossing heritage site london landmarks river views engineering lift times twin towers gothic style walkway exhibitions city of london river navigation architectural beauty public monument educational tours hydraulic power riverfront tower bridge exhibition engineering masterpiece footbridge historical engineering iconic structure london history drone aerial