The monuments exposed are selected for the quality of their architecture or their European symbolism. Numbering 165, the designers and model makers are Belgian, British, Dutch, French, German, Portuguese and Spanish. Most of the monuments were made using moulds. The pieces are constructed from a variety of materials, then copied by silicone moulding. The final copy used to be cast from epoxy resin, but nowadays polyester is used. Three of the monuments were made out of natural stone (e.g. the Leaning Tower of Pisa and the Château de Chenonceau, in marble). A computer-assisted milling procedure was used for two of the models. After painting, the monuments are installed on site, together with decorations and lighting.