The tower of the original Castle - Petra Rubea, meaning 'Red Rock' - stands out on the right if you drive from Carpegna along provincial roads 1 and 6 in the direction of Macerata Feltria and Sassocorvaro: it is part of the remnants of a charming village of stone houses that are particularly atmospheric at sunset.
Pietrarubbia is a place that is not permanently inhabited, although always appreciated by cultured tourists, which around 1960 the sculptor Arnaldo Pomodoro, originally from Montefeltro, had tried to revive. There is a sculpture of it beyond the village of Mercato Vecchio, from where a narrow side road climbs up through the greenery to the village and the castle above it. A path leads upwards towards the tower, high on a rocky ridge: access to the summit is not permitted, but nearby the view reveals the soft and serene Montefeltro landscape.
The Pietrarubbia area is part of the Sasso Simone and Simoncello Interregional Park, with its ample possibilities for excursions and walks.