Tucked away behind a small industrial complex in Hanapepe on the Island of Kauai lies a hidden local treasure: Glass Beach. An easy spot to visit, the beach is made of bright, ocean-frosted sea glass. But a short walk east from the parking area one can find an even cooler gem — a naturally formed lava arch and keyhole cave on a jagged dark amber shoreline. Firm breezes make the tumbling waves of the spot a sight to behold. We captured them on iPhone in this GP Short.