Between Eßweiler and Oberweiler im Tal on an outlying hill of the Königsberg, right on "Landesstraße" (State Road) 372, stands the Sprengelburg (or Springeburg). Judging from the remnants, it was built about 1300 and was soon thereafter destroyed in a feud against the Knights of Mülenstein, who were the castle lords, occasioned by their activities as robber knights. Right up until the 1970s, the site was known simply as "am alten Schloss" (“at the Old Castle”) and the whole ruin was buried under an earthen hill, quite hidden from sight, and with trees growing on it. The ruin's current appearance is the result of restoration measures undertaken from 1976 to the mid-1980s initiated by the State Office for Monument Care ("Landesamt für Denkmalpflege") in Speyer. Since 1983, the ruin has been listed as an architectural monument.