Graven no. 21 was designed and built by architect Carl Lange in 1876 and commissioned by the city to house a social institution but since 1917 it was home to the municipal dental care facilities for public school.
Graven 21 blev tegnet og opført af arkitekten Carl Lange i 1876 og bestilt af byen til at huse en social institution, men siden 1917 har den været brugt til en kommunal tandlæge til folkeskoler i byen.