These acoustic mirrors are located near Denge and are under the stewardship of the Romney Marsh Countryside Project. For one or two days each year the public are allowed access.
A huge amount of information is available on the internet, which I will not repeat on this page. Suffice to say, there are very interesting sentinels to a long-gone age and technology that didn't see 'its day', let alone have it. To have cast these in-situ must have been quite a task.