biology coarse adjustment kn diaphragm education eyepiece fine adjustment knob instrument lens medical microscope object holder objective turret ocular lens optic optical research science viewing ancient architecture blocks destruction enormous foundation Herod historical huge Israel Jerusalem jewish landmark limestone old pavement religion religious Remains remnants ruins stone street temple wall arrow attention beware black danger directions electricity energy german germany Greek high voltage industrial lightning Multilingual ocher pictogram power russian sign signs turkish warning yellow abloom artful beautiful blooming blossom-filled blossoming blushing botanical bud development budding buds charming chromosome colored floral Floral morphology flower Flower Stalk fresh spring young bud