Ok this is strictly only an American update, but given the nature of the web if you want to be at the centre of what is new you have to look stateside.
Yahoo Travel has begun integrating detailed, area specific maps, to places of interest across the US. So rather than just being able to get road and traffic details, you can view info unique to that location. For example, here in the Grand Canyon (scroll down the page) you can see walking routes, camping areas, picnic spots and other handy bits and bobs.
It's a good step forward, hopefully more places of interest will be added to the list, and like all things web, we Euros get in on the action too.