A crossing, in ecclesiastical architecture, is the junction of the four arms of a cruciform church.
Crossing and lantern tower, Rouen Cathedral
Crossing with dome, Florence Cathedral, Florence
Crossing tower, Canterbury Cathedral
Flèche above crossing, Notre-Dame de Paris
A flèche is the name given to spires in Gothic architecture. In French, the word is applied to any spire, but in English it has the technical meaning of a spirelet or spike on the rooftop of a buildin
Flèche of Sainte-Chapelle, Île de la Cité, designed by Jean-Baptiste Lassus.
Flèche of St Michael's Castle, St Petersburg, designed by Vasily Bazhenov.
Model of the flèche of Notre-Dame de Paris made for Eugène Viollet-le-Duc (1859) (Museum of Historic Monuments, Paris)
The Gothic Revival flèche on the St. Peter's Church of Leuven, Belgium.