Torre Rognosa, also known as the Clock Tower or Podestà Tower, is one of the tallest and best-preserved medieval towers in San Gimignano, Tuscany, Italy. Situated in Piazza del Duomo, adjacent to the Palazzo Vecchio del Podestà, this historic tower stands at approximately 51 meters (167 feet) and dates back to the 13th century. Its interior is not open to the public but its exterior can be enjoyed from Piazza del Duomo.
Constructed around 1200, Torre Rognosa originally belonged to the prominent Gregori and Oti families. Its name, "Rognosa," translates to "scabby" or "plagued," a moniker it acquired when the tower served as a prison, detaining individuals with various "troubles" or "rogne." Architecturally, the tower features a nearly square stone base with regular ashlar masonry. Above the crenellations of the old Podestà palace, a narrow architraved opening leads to a small terrace covered by a canopy. The uppermost section houses a belfry with four arches resting on sturdy pillars, topped by a small pyramid roof with red tiles. This design reflects the medieval emphasis on verticality and fortification.