Gangnam Station is a business and nightlife district south of the Han River. Rather than tourist spas, expect saunas in office and hotel buildings, women-only saunas and hanjeungmak (kiln saunas). Opening hours vary a lot, so check before you go late at night.
Most places on this list are ordinary neighbourhood bathhouses with signs in Korean only. These guides explain what to do at the counter, what it costs and the rules on tattoos.