Yeah i was @ National Competition of Information technology in my Country and exactly the same thing was made by some students...

here is some advices

They make all the tour in 3D. By that they model all the thing that they need houses etc...


So how this is done the tour...

You just simply animate the camera and use some program like after effect maybe i don't know.

1st you animate the camera to go left in your tour
2nd you set a script to play that animation if the user press the button...
All this is on a simple picture font and when the user press the button the animation is played and it has the effect like a tour...

I know how to do it ... i hope you get some info by that ... i could not explain all the things sorry....