The Perret tower, also named the "Tower to look at the mountains", is an observation tower located in Grenoble, in the Paul Mistral public park. It is the first tower built in reinforced concrete in Europe. In 1998, it was officially declared to be a national heritage site. It was built in the field of the International Exhibition of Hydropower and Tourism where it was the orientation tower and the symbol of the exhibition. Nowadays, it's the last vestige of this exhibition.