Sweep wrote:... or do you have friends in high places?
No Sweep.
Anti-terrorism surveillance is indeed extremely present with Police/Carabinieri/Guardie di Finanza and private patrols and cameras everywhere.
Yes, during that night I was indeed stopped three times; in front of the Guggenheim Museum I was asked for documents and they wanted to see what I had in my bags ... but eventually they might have understood that they were in front of a "not very normal" person and so they let me to go away.
I had more problems with a private patrol that at the beginning didn't want me to continue on my cycle-walk.
But the worst was at the end (05:30AM) in the backyards parking of the industrial area of Porto Marghera where I had parked the car and found that the whole area was plenty of prostitutes... and maybe something else too!!