Gwangmyeong Cave

Gwangmyeong Cave is a man-made cave in Gwangmyeong, Gyeonggi Province, South Korea. It is located on the far southwestern outskirts of Seoul. Since 2011, it has been open to the public as a tourist attraction, with amenities like a theme park, aquarium, and winery available inside. It is 7.8 kilometres (4.8 mi) long.