Our project concentrates on the highly significant Art Nouveau built heritage of Szeged, Subotica and Senta within the framework of the “2.1.2 Development of thematic routes of cultural heritage” priority, and the exploration, preservation and wide-ranging promotion of this heritage. We firmly believe that we do not know this special cultural and built heritage of ours well enough, and we do not utilise the opportunities they have to offer. Another focal element of the project is heritage preservation, since our built heritage forms a natural part of our environment, i.e. sustainable development applies to it just as much as to the natural environment.In order to achieve these aims, we are going to organise workshops, conferences, and will set the thematic route called “The Jewels of Art Nouveau”, which will be promoted by tourist and art historical brochures, a webpage, and a professional study tour organised for tourist experts. Achievements: Szeged, Subotica and Senta share a common heritage and have strong historical ties, and one of the very important aspects of this joint heritage is certainly Art Nouveau architecture. This special cultural and architectural heritage was not well known or protected, and many of the buildings were found in a state of near-ruin. The two municipalities, Szeged and Subotica, undertook a very comprehensive set of actions in order to identify the Art Nouveau buildings, estimate their present state, renovate some of them which were nearly ruined, base the thematic tourist route on them and thus promote them. Over the course of sixteen months, the reconstruction and preservation of three culturally and historically signifcant buildings were completed. The roof of the Gróf Palace in Szeged was repaired. The northern facade of the Synagogue in Subotica was rehabilitated, while the plans for reconstruction of the roof and the street facing facade of the Schäffer Palace in Szeged were completed. Moreover, the partners conducted architectural and historical research, organised workshops, conferences, bilingual study tours, and the Ferenc J. Raichle memorial exhibition. For promotional purposes, they developed a trilingual webpage, a free trilingual mobile phone application to serve as a guide to the Art Nouveau jewels in the region, and a 15-minute film about the execution of the works in Subotica and Szeged. The project’s main result is a well-organised thematic route called “The Jewels of Art Nouveau” with the related publications, a leporello with a thematic Art Nouveau tour, a book about the Art Nouveau architecture of Szeged, Subotica and Senta, and the memoirs of Ferenc J. Raichle and his work. The well-organised thematic route continually attracts many visitors, and the project can serve as an example of best practice.