Covering some 25 hectares immediately northeast of Old Town at the confluence of the Neris and Vilnia, Kalnų Parkas (Hill Park) is a popular retreat for walks and, during the summer, concerts on the park’s Soviet-era outdoor stage. Also home to the Hill of Three Crosses (see Places of interest), the area the park now occupies is shrouded in a number of contentious mysteries. The so-called Gedimino Kapo Kalnas (Gediminas’ Grave Hill) for example, one of the park's four hills and now a spiritual gathering ground for many followers of the country’s pagan Romuva organisation, is supposedly the site where the founder of the Grand Duchy of Lithuania,  Grand Duke Gediminas (ca. 1275-1341) is buried. No such evidence exists to support the claim however.