"This project is an answer given by teachers participating in it to the new methods of teaching which every educational system in every country needs and the desire of their students have more opportunities in the future not having any limitation or fear to live, work in any european country. Teachers implied in the project tried to teach our students that nothing is impossible, that the difficulties we encounter on our way are to overcome. Having into account the priorities of our project ""The social and educational value of European cultural heritage"" , "" Promoting the acquisition of skills and competences"" and ""Open education and innovative practices in a digital era"". Our project is based in the creation of maths challenges linked to the cultural heritage of each city in order to design a european mathematical route, so our countries and in special our school always will be joined by maths. With these routes our students had improved their knowledges about historical aspects from their own cities, they learnt english terminology related to history and architecture, they needed to use different apps to post in a blog and record videos and audios, they learnt to work together and the importance of planning and dividing tasks to get the targets and of course, they worked in their classes many topics in the maths curriculum of every country in order to prepare maths challenges. In addition, the project also let students to develope other importance values: tolerance, cooperation, solidarity and, above all, a sense of belonging to a much wider community – Europe. When we were together we feel we were no longer Portuguese, Spanish, Polish, Croatian, Italian or even English. We were all Europeans and we realized that when we get to know other nationalities they are pretty much alike, with the same needs, the same feelings and desires. However teachers and students also were conscious of cultural differences between people from every country participating in the project. But they always understood and respected that this was something nice. The differences and diversity is the richness of our beautiful continent. Needless to say that the most serious challenge we had to overcome was the worldwide pandemic we faced, which prevented the project to be concluded as initially scheduled. Students were sad, teachers maybe even sadder … However, we apply for one more year, we kept optimistic and showed a lot of courage to fight against the virus. So, finally we organized the mobility in Poland in July in despite of so many difficulties and fears. Furthermore, in this third year by one hand, we took the opportunity to have so many meetings between coordinators, which made us not just partners in a Erasmus+, it can be say that we're friends and we feel very confortable working together. Even we applied for another Erasmus+ project. And by other hand, we tried to disseminate our project as much as we can. In fact, not just on internet (our web and social media) and in our schools (other students, teachers and families). Also we had a close connection with local institutions in every town in order to imply them in our project and help us to disseminate it. We confess that we feel proud of our work, we got the main results we proposed. To design a website with all the information and materials we've prepared, To prepare our maths routes in every city where school is situated and so to have the opportunity to get our brochure with the routes and putting it in the local tourist information. And to organize every mobility having in them, activities scheduled related to the project. But what it's more important, we had in our project a fantastic atmosphere between teachers and students. And we just didn't mean during the mobilities, where at the end, on the farewell, was a truly drama for students participating in it to say goodbye because they felt that they really had enjoyed and had learnt so many things for their future. We also mean about the kindness, the dedication and the effort of everyone made in order to fullfill the targets planned. They got in contact using different tools (Etwinning, whatsapp, mail), they worked using blogs, etwinning, drive, meet, genially, facebook, twitter, youtube,... And all of us helped eachother. This is an Erasmus+ project!.Words like “great, incredible, unbelievable, awesome” are used by our students when referring to this experience but deep down we believe that “rewarding”, “enriching” and “unforgettable” are probably the ones that best describe it. Projects like this, though time consuming and demanding, should keep on happening as they are a valuable asset to those who participate in them.Our website is https://erasmusplusmaths.wixsite.com/erasmusplusmathsOur Twinspace is https://twinspace.etwinning.net/73183/home"