The third set of structures are buildings that have had a clock face or faces added after the original building was constructed such as the Palace of Culture and Science. The second set of structures are buildings (rather than towers) that had clock faces on the exterior as part of their original design such as the Wrigley Building. Some clock towers of this type are freestanding, such as the Joseph Chamberlain Memorial Clock Tower, while others are attached to, or on top of, buildings such as the tower on the Philadelphia City Hall. Some structures of this type were originally built as bell towers and had the clocks added later, such as the Springfield Campanille. Possibly the most famous example is the colloquially termed Big Ben. The first type of structure are proper Clock towers which are structures that fulfil the definition of a tower with a clock face or faces on the exterior wall or walls. The list includes various structures with a working clock face or faces on their exteriors. A list of the tallest structures with clocks on their exterior that can be seen from the ground.

Download biggest clock tower