Virtualfieldtrips is a guided exploration through the world wide web that organizes a collection of pre-screened, thematically based web pages into a structured online learning experience. (Foley, 2003) Below are some sites I found that may be of interest.
http://lib.utexas.edu/geo/onlineguides.html
http://www.simplek12.com/virtualfieldtrips
http://www.field-trips.org/trips.htm
http://www.uen.org/tours/
http://www.museevirtuel-virtualmuseum.ca/index-eng.jsp;jsessionid=ED9AAFB5DAB7C603979E6A09591BF69B
http://www.kn.pacbell.com/wired/fil/pages/listvirtualgr.html