I have a short list of virtual tours on a page I did for teachers. You
can find them here - way at the bottom of the
page.http://www.bcsc.k12.in.us/richards/inside/Wtools.htm I am trying
to learn how to make a mini link so that you could click on a word and
it will take you to the spot in the page that you're looking for.
The nga.gov is good. Sipapu is also here.