Greatstone, England

Greatstone Sound Mirrors

Huge concrete structures designed as an early warning system for Britain to detect enemy aircraft


The massive concrete acoustic mirrors, or β€œlistening ears,” lining the southeast coast of England were built between the world wars to monitor the skies for the telltale sounds of airborne invasion.

Built between 1927-30, the sound mirrors were part of Britain's national defense strategy. Their parabolic shape collected and magnified sound waves in the air over the English Channel and directed them at a microphone positioned just in front of the parabola. Anti-aircraft defenses were then deployed. The mirrors effectively gave Britain a fifteen-minute advance warning of an impending attack.

The site features three different reflectors, including a 200-foot-long curved wall, a 30-foot-tall parabolic dish, and a smaller 20-foot-tall shallow dish. All three can be seen in Greatstone, located in the north east side of the Dungeness Nature Reserve.

  • Address
    Greatstone, England, TN28 8SB, United Kingdom
  • Cost
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