Startup Idea : Crowdsourced Guided Tours

Linking voice, video to specific walking or driving paths created by any user, anyone could create guided tours anywhere. Discovery engine to show most popular paths in cities as well as most popular tour guides. Imagine taking walking a path created by someone you know and trust. Or a local celebrity. Paths could be broadcast live around the world for people to virtually experience a tour (e.g. Josh's Hollywood tour). Local businesses can work with tour guides to create private paths or paid paths with surprises/specials.