United Kingdom
Ranging between 20 and 200 feet in diameter, these Orwellian sentinels tower eerily over the shingle peninsular of the Dungeness National Nature Reserve. Erected between 1928 and 1930 the three concrete 'listening ears' detected the approach of enemy aircraft, but when radar was invented before WW2 they became redundant.
You can get up close to these impressive feats of engineering is by joining one of Dr Richard Scarth's walks organised by the Romney Marsh Countryside Project. Check the noticeboard on the Project's website for dates.
Romney Marsh Countryside Project
website: www.rmcp.co.uk/NoticeBoard.php
Phone: 01797 367934
More info: www.greatstone.net/history/sound_mirrors.htm
Google map: bit.ly/zeXoCe
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