In the 17th century they were associated with the followers of Jacob Bohme, and were undisturbed until 1708, when an inquiry was made as to their doctrines.
Martensen's Jakob Bohme (1881) belongs to an earlier period.
In the public park there is a bust of Schiller, a monument to Alexander von Humboldt, and a statue of the mystic Jakob BOhme (1575-1624); a monument has been erected in the town in commemoration of the war of 1870-71, and also one to the emperor William I.