Zip World Penrhyn Quarry is home to Velocity 2, the world’s fastest zip line, and Quarry Karts, the UK’s only mountain cart track. Reaching speeds of up to 100 mph, Velocity 2 is also a guided adventure experience that lasts for approx 2 hours, and is located in the most dramatic of settings amongst the mountains of north Wales. Want to stay a bit closer to the ground? Quarry Karts is the ultimate test of nerve as you make your way along the 3km slate track in our gravity-fuelled 3 wheelers, and take in the stunning views of the snowdonia mountain range.