Emerging on top of a hill planted with pines, the enigmatic stone silhouette of Castel del Monte, devoid of a roof structure or crenellations, stands out clearly against the sky and is visible from miles around. For centuries, this castle built in the 13C has been a source of fascination and questions, yet its function remains shrouded in mystery. However, its aesthetic and architectural qualities have resulted in its recognition by UNESCO. Admire, in particular, its superb gateway and its eight towers. The whole site offers stunning views of the surrounding countryside.