"Line of light" spans Hadrian's Wall

As a kickoff for British Tourism Week, 500 volunteers illuminated the 84-mile Hadrian' Wall across norhtern England with a "line of light." (video)

The task was accomplished by using gas-powered beacons planted 820ft (250m) apart. The light display lasted for 30 minutes. Volunteers from around the world signed up to take part in the event.