For safer cities, there is a new option-
Self-guided audio tours!
They give you the flexibility to see what interests you while getting the key information for that city.
You can find some free on-line, while others charge nominal cost. Others can be purchased either in advance on the web for your destination or at local shops.
I think this will be a trend of the future as society gets more technological and we want to learn more but don't want the time limitations.
WAV and MP3 formats that can be used on CD & MP3 players, cell phones and Ipods.