Nakayama Wind Caves

The wind caves at Nakayama create a microclimate that keeps ground temperatures between 5 and 10 degrees Celsius even in summer, allowing alpine plants to grow at 550 meters rather than their usual 1,500 meters. The caves formed millions of years ago when volcanic activity created layered rock chambers that cool warm surface air as it passes through and release it back upward. Honshu's largest colony of prickly wild rose grows here, best seen in May. A hiking trail connects six spots where cool air can be felt rising from the ground. For centuries, local residents used the largest cave as a natural food storehouse, and the silk industry later stored eggs there to control hatching times.