Parowóz Sauna is a lakeside sauna in Łomianki, about 15 minutes' drive from Warsaw, that began as a mobile sauna. It has two wood-fired Finnish saunas built of thermowood, seating 6 and 10 people and reaching up to 110°C, with the lake 12 steps away for cooling. It runs seasonally from mid-October to April and reopens in the first half of October 2026. Individual entry costs 49 zł for 1.5 hours in the large sauna or 39 zł for an hour in the small one, and both can be hired privately.