Berlin has 4 main Saunas with Treibhaus Sauna (Schoenhauser Allee 132), located near several of the bars, known as "Berlin's most beautiful sauna." It boasts a huge whirlpool, Finnish sauna and two levels of action. Toys, magazines, and other queer goodies are for sale, and they provide internet access too.
Good food and drinks await you at their in-house bar and cafe, and in the lounge you can relax after long sessions in the wet area. Therapeutic massage appointments can be arranged too. Treibhaus is one of East Berlin's most popular gay businesses and attracts a truly varied crowd of men of all ages, open 1 p.m. to 7 a.m. daily and non-stop through the whole weekend until Monday morning.
Located 300 meters from the Brandenburg Gate, the aptly named Gate Sauna (Wilhelmstrasse 81), the other bathhouse on the east side, is a cozy, intimate place, often frequented by bears and their cubs.
Apollo Sauna Club Brasil is one of the biggest in berlin and is popular at weekends. Steam is an iuntimate smaller sauna with a popular happy hour.
Many of the saunas run promotions and special offers throughout the year. Check the local gay magazines for the most up to date listings when you get to Berlin.