Hassan Tower, located in Rabat, Morocco, is an unfinished minaret of a grand mosque that was intended to be the largest in the world during the reign of Sultan Yaqoub al-Mansour in the 12th century. Standing at 44 meters (144 feet), the tower was meant to reach 86 meters but remained incomplete after the sultan's death. Constructed with red sandstone, its intricate Islamic designs, including arched doorways and geometric patterns, reflect Almohad architecture.

The surrounding area, known as the Hassan Mosque, features columns that mark the mosque's foundation and add to the historical atmosphere. Today, Hassan Tower is a UNESCO World Heritage site and serves as a symbol of Rabat's rich history and cultural heritage.