« There are two entrances to the cave: one for walking and another for water activities, where you can enjoy a motorboat ride for a full 5 minutes after standing in line for 20. Right at the entrance, you are hit by a chilly underground air—saying it's cold would be an understatement; spending more than half an hour there really makes you freeze. The cave is filled with tunnels that feature various installations: miners extracting amethysts, stages of Homo Sapiens evolution, ancient rock paintings, and, of course, the amethysts themselves. Every hour and a half, there's a show featuring Chinese acrobats. There’s a small café-like place where you can warm up near a heater with a cup of freshly brewed coffee in a paper cup. It's quite crowded, as families come in droves, and there are many elderly people, which is quite common here; in Korea, retirees enjoy their leisure time outdoors, going hiking, taking trips, and staying active. »