Let's take a fieldtrip around the world! Take a look at these great websites:
NOVA – Pyramids: http://www.pbs.org/wgbh/nova/pyramid/
Museum of the City of San Francisco: http://www.sfmuseum.org/
National Geographic Xpedition Hall: http://www.nationalgeographic.com/xpeditions/hall/
expeditions@fieldmuseum: http://www.fieldmuseum.org/expeditions/interactive_main.html
The Field Museum Ancient Americas Exhibit: http://www.fieldmuseum.org/exhibits/americas_permexhib.htm
sitesALIVE!: http://www.sitesalive.com/index.html