A clock tower is a tall structure that houses a clock, often visible from a distance. These towers are typically found in public squares, city centers, or on the grounds of important buildings. They serve both a practical purpose, providing time to the community, and an aesthetic one, often featuring intricate designs and architecture. Many clock towers are equipped with bells that chime at regular intervals, marking the hours and sometimes the quarters. Famous examples include the Big Ben in London and the Campanile of St. Mark's Basilica in Venice. These structures often become landmarks and symbols of their respective cities.