Mo. Rev. Stat. § 82.240

It shall be lawful for any such city to make provision in its charter, or by amendment thereof, to acquire and hold by gift, devise, purchase or by the exercise of the power of eminent domain by condemnation proceedings, lands for public use, either within the corporate boundaries of such city or outside of such corporate boundaries, and within the territorial limits of the county in which such city may be situated, for public parks, cemeteries, penal institutions, hospitals, rights-of-way for sewers, or for any other public purpose, and to provide for managing, controlling and policing the same.