One of the most important Catholic pilgrimages in Central and Eastern Europe is held every year in the Hargita county, in Romania. On Pentecost day, there are over 100 thousand Catholics from around the world, but mostly Hungary, that come to Csíksomlyó to attend the service dedicated to Virgin Mary, which is held on the Kissomlyó Mountain. In 2024, approximately 300,000 pilgrims traveled to participate in the celebration. According to the mayor of Csíkszereda, Korodi Attila, about 310,000 pilgrims joined the pilgrimage. The Agerpres news agency reported that some of the pilgrims traveled over a thousand kilometers, spending about 2 months on the road. The Franciscan Order, present since 1352 in Csíksomlyó, organizes this pilgrimage in the memory of the fallen Szeklers in the battle from 1567 against the troops of Prince of Transylvania, János Zsigmond, who tried to impose the Unitarian religion to Roman Catholic believers from the Szekler Seats—Csík, Gyergyó and Kászonszék. Because the event has a tradition of 450 years, the Ministry of Culture, local authorities, and the Franciscans wanted to include this pilgrimage on the UNESCO’s Intangible Heritage List in order to connect the region to the global cultural exchange, and therefore elaborating the necessary documentation for this purpose. The pilgrimage creates for researchers in the field of intangible heritage, an extraordinary material for studying of the mentality and current religious practice. The pilgrimage was, is, and will be an effective means of exploiting, developing, and promoting local heritage in all its entirety.