Haeundae Spa Center (해운대온천센터) is a hot-spring bathhouse a short walk from Haeundae Station, in the building of the former Halmae-tang, which the center calls the first natural hot-spring bath in Haeundae. Its baths use undiluted seawater hot-spring water, and the fourth floor has three sauna rooms lined with red clay (hwangto), tourmaline and salt stone. A fitness floor sits upstairs. Single sauna entry is 12,000 won for adults, and the center closes every Wednesday.