Canal Archive, there are multiple places you can hear enchanting music and go underground. So, what's your thought? None of us will know if you are correct until we embark on the journey! Part of the fun of this is hearing what others think. First thing we thought of was the church in the underground salt mines, but then changed our mind as what we were thinking of was in Poland, and considering what's going on right now in Poland's backyard, we doubt Uniworld would take us there.