inside the catacombs of salzburg at the st.., saint peter's cemetery, stairs leading up to the getrauden chapel,

stairs getrauden chapel catacombs salzburg austria saint peter peters cemetery graveyard petersfriedhof catacomb stairway stairwell staircase church hermitage cave getraudenkapelle monchsberg hidden secret window remote carved rock hewn dug cut hole stone architecture historic christian landmark monument tourist destination attraction sightseeing tour guide inside interior