Riela is a modern bathhouse on Calle de Apodaca inspired by Roman thermae, Japanese onsen and Russian banya. Its 75-minute self-guided thermal circuit runs through a 90°C Finnish sauna, a 50°C steam room, a hot mineral pool of 40 to 42°C, cold plunges at 4°C and 8°C and a heated granite stone. All spaces are shared, guests must be 18 or over, walk-ins are welcome, visitors bring a swimsuit and everything else is provided, and phones stay out of the bathing areas.