Lake Manapouri
especially the West Arm and Manapouri Power Station - Take a bus trip over the Wilmot Pass to Deep Cove. The power station, one of New Zealand's largest, has been carved out of solid rock below the lake and two tailrace tunnels take the water that passes through the power station to Deep Cove, 10 km away. The only evidence that there is a power station nearby is the power lines that disappear into the ground!
