Highway 340, West Maui
This large volcanic rock sitting on the side of the road has an unusual capability - it sounds like a bell when struck in the right spot. There are several such stones throughout the islands and the sound they make is due to the chemical composition of the lava. If you strike this rock on the right side (mountain side) you will hear a metallic clank.
Take Highway 340 out of Kapalua. The bellstone is located before Mile Marker #16 on the right side of the road.
Small gravel pullout located past the bellstone
Use another rock or stick to strike the stone. You may need to try several areas on the stone to find the right spot.