Google continues to blow me away. I know about street view, but now there is trail view.
See the link.
I wrote about how the Internet would create a virtual tourism experience and Google just raised the bar.
My paper, published in Tourism Geographies last century, can be found at http://www.tandfonline.com/doi/abs/10.1080/14616689908721311#.UgvAQrJlRcQ
Bristow, R. (1999). Commentary: Virtual tourism — the ultimate ecotourism?
Tourism Geographies, Vol. 1, Iss. 2, pp. 219-225.