The city was fortified in the 13th century by palisades and a rampart-ditch system, later it was fortified by walls and rampart-ditches; 24 "Wiekhäuser" and two high towers reinforced the city wall. In addition, there were three gates, the Altruppiner/Rheinsberger Tor in the north, the Berliner/Bechliner Tor in the south and the Seetor in the east. The complete walled enclosure occurred at the latest towards the end of the 15th century.

Neuruppin's oldest part was an elongated Anger, accompanied by