Steam Yourself and Your Breakfast in Korean Sauna in New Jersey: The Bul Hanzung Mok room at King Spa Sauna in Palisades Park, New Jersey, uses smothering oak wood to achieve temperatures as hot as 395 degrees Fahrenheit. And customers aren’t the only things sitting in the heat: Every morning, spa workers line the room with cartons of eggs, which they sell later in the spa restaurant.