Length of the circular trail: 16 km
Start: Pazin, Spomen dom (parking lot)

Attractions on the trail:
Panorama of Pazin valley, Učka mountain and  Ćićarija, panorama of Grdoselo & Butoniga lake, Grdoselo, Zelengrad - abandoned medieval town, canyon of Butoniga stream, picturesque waterfalls

Finish: Pazin, (parking lot) or Dušani

Zelengrad was first mentioned in 1102. Today this completely ruined town, was once a castle of trapezoidal ground plan, placed on a hill under which the Grdoselo stream flows into the Butoniga stream. It was also for the first time mentioned in 1102. in "Istarski razvod", a well-known Glagolitic legal document from the beginning of the 14th century.