Six onion-roof towers supporting heavens

[Jorge_Stolfi]

The domes (onion-shaped) are of Swiss-Italian origin.

if you are referring to the "onion towers" ("Zwiebeltürme") of Switzerland, those seem to be a Baroque (17th century) "import" from Germany and Austria.

Here is You are not allowed to view links. Register or Login to view. depicting an onion dome.  Admittedly this still looks like the Persian/Pakistani/Indian domes  in the proportions, finish, and tip.  (The peacocks may be related to that, perhaps?)

And here is You are not allowed to view links. Register or Login to view. Polish(?) manuscript featuring a onion dome.  (The manuscript is believed to be a copy of a 13th century original, but it is possible that the images were "updated" by the copyist.) Admittedly this dome is only a little wider than the tower; not more than twice as wide, as the St. Petersburg example I posted earlier.

All the best, --stolfi