The Opelbad on the slope of the Neroberg on the site between the former Neroberg Hotel and the Russian Church was inaugurated on 16.06.1934 after two years of construction. It was built according to the plans of architects Franz Schuster (Vienna), Edmund Fabry (Wiesbaden) and horticultural architect Wilhelm Hirsch (Wiesbaden).

Schuster, for a time a teacher at the Wiesbaden School of Arts and Crafts, was, like Fabry, committed to Bauhaus architecture. Like a ship on the waves of the forest, the terraced Opelbad floats along the slope of the Neroberg, with a restaurant as the bridge and the railing as the railing.

The Opelbad was primarily intended as an attraction for spa guests, who were difficult to attract in the early 1930s. The city decided in 1931 that it should become a "summer swimming pool" and "serve the spa life in particular". Wiesbaden advertised in the 1930s with the slogan that it was a "synthesis of sun, water, air and forest". The Opelbad, which is still considered one of the most beautiful swimming pools in Germany today, was an instant success story: 51,000 tourists and 42,075 bathers were counted in the very first bathing season. The namesake, Wilhelm von Opel, a major industrialist living in Wiesbaden, donated 150,000 marks for the construction, while the city paid around 100,000 marks.

The Opelbad has a 65 m long and 12 m wide swimming pool, a diving tower and a slide as well as a paddling pool for children.

Towards the end of the Second World War, the pool was closed, and after their invasion of Wiesbaden on March 28, 1945, the American occupation troops confiscated it. It was not until 1952 that they returned it to the people of Wiesbaden. For a long time, the baths were in the care of the spa administration, later the spa companies.

Since 2008, it has been part of the city's own Mattiaqua operation, which also includes the thermal baths in Aukammtal.