Τhe “ArcH App” project argues that European architectural heritage, intertemporally present in our urban contexts, constitutes a common reference point for the inhabitants of cities across Europe, capable of inspiring young people to reflect upon “what makes us European”, as well as upon the privileges and responsibilities deriving from our shared values. Regarding heritage buildings as powerful examples of intercultural exchange at both European and international level, the project intends to promote active citizenship and civic participation, by leveraging the potential of youth as a social multiplier. Through the manifold activities proposed by the project, young people of various sociocultural backgrounds supported by their youth workers, become familiar with the buildings’ historic and cultural value, and, subsequently, aware of the multiple challenges these buildings are currently facing. Addressing digital transformation through development of digital readiness, resilience and capacity at the same time, “ArcH App” acknowledges the necessity of advanced digital skills in a Digital Era, it proposes to upgrade the digital proficiency level of youth worker participants, so as to include the development of digital tools for a social purpose. The project proposes to both participants and independent users an enriched learning experience through interactive digital maps giving access to digital guided visits to selected heritage buildings around the participating cities. Furthermore, aiming to connect its key concepts and thematics with real-life needs in the corresponding communities, “ArcH App” offers youth workers of various fields of practice the opportunity to update and enrich their digital know-how regarding the functions and uses of mobile applications for supporting their youth groups in the co-creation of an alert mobile platform that will efficiently promote and protect built heritage.