The approximately 5.7-hectare Nerotal parks are an extension of a green corridor that extends from the Taunus into the city and supplies the city center with fresh air. The area, previously used for agricultural and commercial purposes as a meadow valley of the Schwarzbach, was converted into an English landscape garden in 1897/1898.

The basic idea was to create an ideal setting for nature between the upper-class villas on both sides of the valley. According to the species list from 1905, around 6,000 plants were used, including 75 coniferous and 300 deciduous species as well as around 70 different types of shrubs and grasses. A large number of older, strong trees - birches and maples from the Neroberg, lime trees from Taunusstrasse, spruces from the former Schiller monument, beeches from the spa gardens - were also planted, as it was called at the time. The Nero Valley park was known as "Wiesbaden's botanical garden"; the cork tree, the Japanese pearl string tree, the mountain sequoia, the Chinese witch hazel, the American hackberry and the handkerchief tree all thrived here.

The park offered visitors attractions such as the preserved Swiss cottage, small grottos, waterfalls and miniature villas. The Schwarzbach stream, which flows through the Nero Valley Park, two ponds and extensive meadows and lawns characterize the park's appearance. Many of the paths running through the park, as well as the roads to the right and left of the park, date back to former agricultural and forestry roads or promenade paths. To this day, their curved course acts as a "picturesque, harmonizing connection between urban form and landscape".

The Nero Valley park is bordered on the city side by a war memorial (in the Nero Valley) and to the north by the valley station of the Nerobergbahn cable car. The only larger building in the complex is the former cold-water spa, now the seat of the thalhaus.