Guests can fly down the Fremont Street Experience on two levels, the upper Zoomline (114 feet up) or lower Zipline (77 feet up). The SlotZilla zip line is the world’s largest slot machine, standing a towering 128 feet tall. Not surprisingly, we’re starting with the biggest, baddest slot machine anywhere. We’ve gathered a few we consider must-sees during a visit to downtown and Fremont Street Experience. Slot machines are everywhere in Las Vegas, but in downtown Las Vegas, there are some that truly stand out.