Realistic modelling of the behaviour of large-scale structures for dynamic analysis is considered. The importance of well-documented and reliable testing procedures is emphasised. Several structures were tested under ambient and forced vibrations: a suspension bridge, a gravity dam and the inclined tower of the Montreal Olympic Stadium. Evaluations of frequency responses and dynamic properties are presented for each structure. The use of these results in finite element correlation studies is discussed and the prediction of analytical models are compared with experimental findings.