Where to leave my bike when im not staying at a hotel in a city

Hello all, I am currently on a month long tour where i go through Luxembourg, France, Switzerland, Italy, Austria and Germany. I am currently in Lugano and want to take a walk. I don’t have accommodation here though. I want to leave my bike somewhere though, so I can just have a nice visit in the city. Where should I leave my bike, any suggestions? Thanks in advance! Oh and some pics of the tour until now.

by bsodzzz