The romanesque-byzantine style, 1000 years old leaning bell tower of Caorle (Venice, Italy) is a unique masonry structure, characterized by single and double lancet windows harmonically distributed on a cylinder-shaped shaft surmounted by a conic cusp. A terrestrial laser scanning (TLS) survery was carried out in 2011 and some analyses were performed on the resulting point cloud to provide the following: bell tower leaning angle, wall inclination/tapering and radius, local deviation from circular shape, and local curvature. Emphasis was placed on the changes of these quantities with elevation. In order to perform these analyses, a MATLAB/Octave toolbox was developed and is available as supplementary material of this paper. In this way, a reliable picture of the urrent geometry of the ball tower was obtained. In particular, a correlaton between learning angle (avarage value 1.4° towards East-South-East) and some surface deformations and damage (bulges, brick, displacements or also material loss) was found. These results ae used for cultural heritage preservation purposes.