Boryeong Spring Cool Tunnel & Rest Area is located on the slopes of Seongjusan Mountain in Boryeong-si, originally an abandoned mine that extended underground for hundreds of meters. Even in the summer when temperatures soar above 30°C, the cool breeze here maintains around 12°C, making it cooler when the outside temperature is high. Dishes made from button mushrooms cultivated using the abandoned mine are also available for dining.