This organization hosts electronic field trips with four main parts: the trip, journal, the virtual visit (a streaming video), an Ask the expert tool, and a hosted web chat.
This site is terrific for students and teachers for all grade levels. Click Online Tours and you can explore an artist, theme, or artwork. Click NGA Kids and you will find interactive games and activities for elementary school children.
Lovely provides a hot-linked list organized into live journeys, "interactive environments," travelogues, e-museums, building and place tours, map-based visits, and read-along visits.