Ever wondered how far the Great Wall of China would stretch it it snaked across Western Europe? Or the size of Stonehenge it it were in New York's Central Park?
Now you can...
Interesting project from the BBC announced today to show how historical events and places around the world can be reinterpreted by using a Google Map mashup.
Dimensions simply integrates the size of historical events with a user's own location or any other place around the world, overlaying important places, events and things on a satellite view on a Google Map.
Officials say:

"We've built a system that can quickly take scale illustrations of historical events and superimpose them on zoomable, clickable maps. Information designers at the BBC research and produce these illustrations based on a range of library and on-line resources to make them as accurate as possible."
Simple yet extremely interesting.
The project is broken into different subject areas, including space travel, cities in history, festivals and ancient worlds.
The people behind the project are hoping to refine the system and eventually integrate into the BBC's science and history sections online. Travel section, too, maybe?