How big really is an excellent resource for geography and math teachers who want to put objects from around the world into perspective that students will understand. For instance how big was the recent Gulf oil spill in comparison to the Great Barrier Reef?

The BBC Dimensions site aims to bring home the human scale of events and places in history. The D-Day landing beaches measured from London to Norfolk in the UK. How far would the Titanic stretch down your street?

Dimensions simply juxtaposes the size of historical events with your home and neighbourhood, overlaying important places, events and things on a satellite view of where you live. Certain "Dimensions" can be transformed into short walks, so you can get a physical appreciation of the distances involved.

Below is an image of the Oil Spill over part of Great Britain. Access Dimensions here