Hi, in Italy I know two places very interesting for overtones singing: In Padova, a city near Venice, there is the "Tempio della Pace", a cathedral with great resonance power.
Near Padova, in Teolo, a cave named "Grotta di S.Antonio Abate", where I have filmed my video "Tibetan Overtones in the cave".
Yes Jens! And overall is the History of this place that' absorbing... The cave of the oracle is in the city of Cuma, first greek settlement in Italy. Ovidio in Metamorphosis, tell that Dedalo after the loss of the son Icaro, arrived in the place of Cuma and built the temple dedicated to Zeus, It's visible in the acropoli of the city.
Besides not so far live a nice musician Davide Della Monica, He's member of a very interesting multietnic musical Group, La mezcla, they do traditional and world music...