Tower / spire
Many parish churches have a tower at the west end of the nave.
Some are topped by spires.
The tower may have been part of the original building, or added or enlarged at a later date.
Some churches have a tower between the chancel and nave, with a transept at either side.
In this case, the space inside the church at the intersection of nave, chancel and transepts is called the crossing.
The tower often contains the church bells.
Church bells are pulled up from ground level, usually with the assistance of a form of treadmill.
Today the tower also often contains the clock workings.
(text and images courtesy of Heritage Inspired)