The bell gable is an architectural element crowning the upper end of the wall of church buildings, usually in lieu of a church tower. It consists of a gable end in stone, with small hollow semi-circular arches where the church bells are placed. It is a characteristic example of the simplicity of Romanesque architecture.
Simple bell gable at the St. James' Church of Entença (Spain), near the Pyrenees.
Bell gable at San Blas de Illescas Church, Puerto Rico
Single-eyed bell gable of the Amaxalco oratory, in Tlalpan, Mexico.
Four-eyed bell gable at Sant Pere d'Ullastret church, Spain.
A bell tower is a tower that contains one or more bells, or that is designed to hold bells even if it has none. Such a tower commonly serves as part of a Christian church, and will contain church bells, but there are also many secular bell towers, often part of a municipal building, an educational establishment, or a tower built specifically to house a carillon. Church bell towers often incorporate clocks, and secular towers usually do, as a public service.
Bell tower of the former monastery in Dürnstein, Lower Austria
Elizabeth Tower, London completed in 1859; better known as Big Ben.
The Leaning Tower of Pisa, campanile of the Duomo di Pisa, Italy
St Mark's Campanile, Venice