At the Met in New York, there is a painting of Versailles that is 166 feet long and makes a complete circle around you as you walk through the room where it's displayed.
More picturesMatt and I sometimes talk about providing images in a similarly immersive manner. Something like Google Streets, but with real images from all kinds of sources. That's Matt's idea.
Mine is simpler. A room of any size, with screens on two or three walls, so if you sit closely enough, the images surround you.
I can imagine either one being a good substitute for travel to far off places.