The following links are some of my favorite Virtual Tours:
Links
Anne Frank's Secret Annex
British Museum, London
Ford's Theatre
Gettysburg National Military Park
Italy: All Roads Lead to Culture
National Aquarium
National Museum of the United States Air Force
Machu Picchu
Smithsonian National Museum of Natural History
Sydney Opera House
The Hidden Worlds of the National Parks
The Louvre
Washington D.C.
Washington's Mount Vernon
Anne Frank's Secret Annex
British Museum, London
Ford's Theatre
Gettysburg National Military Park
Italy: All Roads Lead to Culture
National Aquarium
National Museum of the United States Air Force
Machu Picchu
Smithsonian National Museum of Natural History
Sydney Opera House
The Hidden Worlds of the National Parks
The Louvre
Washington D.C.
Washington's Mount Vernon