The purpose of the master's thesis is to design a cross-curricular excursion for year four grammar school students who have History and Geography selected as their elective matura exam courses. For the cross-curricular excursion the trail of the Alpine regions of Slovenia was chosen because the regions make it possible for students to get acquainted with both historic and geographic teaching contents. In the first part of the thesis, the theoretical features of excursion are introduced. Moreover, cross-curricular approaches with an emphasis on the analysis of the History and Geography curricula for grammar schools are presented. This part establishes that there are many possibilities to use cross-curricular approaches of History and Geography when it comes to the cross-curricular excursion to the Alpine regions of Slovenia. The itinerary with a lesson plan and handouts was designed by doing a field overview of the cross-curricular excursion trail. The survey answers of the 4th year high school students and the interview with the Gimnazija Kranj Grammar School teachers show that cross-curricular excursions in Slovenia are sensible and that knowledge of high-school students is more permanent and of higher quality.