Suzi, boy do I know what you mean. We were in Dubrovnik on Celebrity's Millennium a few weeks ago and the ticket seller claimed that the wall around Dubrovnik was "chair friendly". Pat (an 83 year old, mostly chair bound, wonderful lady) made it up the stairs to the top of the wall. We were all teasing when she took the last step that it would be her last.
Once on the wall, guess what? It was about as unfriendly as you could imagine. I managed to get Pat back down the stairs and into a bar for a cold beer.
Unfortunately, Europe is lightyears behind the U.S..