The project called “Today, you imagine the European city of tomorrow—Ideas to build the future,” involves a strategic partnership between four middle schools: Collège Ernest Perrier de la Bathie in Ugine (France), Şcoala Gimnazialǎ in Gâdinţi (Romania), Academic Lyudmil Stoyanov Ezikova Gimnazia in Blagoevgrad (Bulgaria), and Institut Carles Vallbona in Granollers (Spain), along with three associations: Le Grand Bivouac (France), the Savoy Conseil d’Architecture, d’Urbanisme et d’Environnement (France) and the cooperative society Andelssamfundet in Hjorshøj (Denmark). The project is due to last thirty-six months, divided into nine thematic three-month periods. It enables students to imagine and create together a virtual future city which, according to the EDD-SI measures, will tackle the problematics of sustainable development—whether environmental, economical, or social ones. Based on educational cooperation, transdisciplinary activities and an exchange of innovative educational methods, this collective reflection will address topics such as: how to make the most of natural resources, and how to assess the ecological impact of infrastructures. It will also address social diversity and the citizen’s role in such a European city, as well as the factors that can improve quality of life together. Out of the four middle schools that take part in the project, three are situated far from places where culture thrives. Therefore, the project aims at developing students’ ambition by opening them to the world, but also urging them to grow autonomous and responsible by putting them at the heart of all propositions and letting them play a big part in the evolution of our societies. The “European city of tomorrow” will grow in a collective digital working space, fed and improved by each participant, who will upload the results of educational activities lead in class, the conclusions of students’ reflections and their ensuing practical propositions. During the nine three-month periods, we will program six five-day cycles of transdisciplinary activities. Those will enable students, teachers and members of associations to continue their work, to meet, and to study local resources linked to previously chosen themes. During those cycles, we will offer a variety of events to a wide public. Moreover, some activities will result in intellectual productions which will help spread the methods and achievements beyond the circle of the partners of the project. Among those events, there will be public show-like lectures, prepared and hosted by the students. The shows will be filmed, subtitled and gathered as a six-DVD boxset distributed through each partner’s own distribution channels. Besides, we plan to make two brochures by the end of those three years. They will be called: “We young citizens of tomorrow and our ideas to build the future,” and “A guide for a school involved in sustainable development.” They will gather and sum up the ideas and methods developed through our collective European project. Indeed, our goal is to have a real impact on the schools and associations in this partnership. And why not go further? Consider enabling organizations to engage in sustainable development through a coherent approach, and giving the youth the power to invent their future in a world which is more respectful of the environment.