Unique experiences of southwest Europe [closed]

I'm an American, going to southwest Europe soon. I'm looking for unique things to do. By unique I mean things where I could not get a similar experience at home or even other places in America.

For example someone sent me a newspaper article that in Venice you can get lessons on rowing a gondola. That seems like a very uniquely Venice thing to do. On the other hand there are lots of great parks and trails with natural views in Europe but America has great national parks too. The views aren't exactly the same but it's still similar, not as much a unique thing.

I guess you probably want me to tell you the specific place I am asking about but I don't have just one. I wanted to find some interesting things to do and then plan my path around that. But to hopefully narrow it down some, the rough plan goes northeast Spain, south coast of France, north Italy, Switzerland, and Bavaria. Would it help if I asked separately for different regions or cities?