The Wawel ensemble, including the Royal Castle, the Wawel Cathedral and other monuments, is perched on top of the Wawel hill immediately south of the Cracow Old Town, and is by far the most important collection of buildings in Poland. St. Leonard’s Crypt is located under the Wawel Cathedral of St Stanislaus BM and St Wenceslaus M. It was built in the years 1090-1117 and was the western crypt of the pre-existing Romanesque Wawel Cathedral, so-called Hermanowska. Pope John Paul II said his first Mass on the altar of St. Leonard’s Crypt on November 2, 1946, one day after his priestly ordination.
Benedetto, A., Pajewski, L., Dimitriadis, K., Avlonitou, P., Konstantakis, Y., Musiela, M., Mitka, B., Lambot, S., & Zakowska, L. (2016). Ground-penetrating radar investigation of St.Leonard’s Crypt Under the Wawel Cathedral (Cracow, Poland) - COST Action TU1208. Geophysical Research Abstracts, 18, EGU2016-17965. https://hdl.handle.net/2078.5/78745 (Original work published 2016)