For those who don't recognise the name, Menwith Hill in the UK is the largest RSOC ("spy base") in the world, and vaccuums up communications from all over Europe for use by the NSA. Recently the ukcrypto list discussed Menwith Hill Tours, which has been organising sightseeing trips over and around the facility. You can find more information at http://www.menwithhill.com/, here's a taste: "Menwith Hill Tours - a beautiful piece of America, right here in England Located near idyllic Nidderdale in the tranquil Torkshire Dales, Menwith Hill has SO MUCH to offer. Whether you are a day-tripping family, a dissident, or simply an amateur enthusiast, a visit to Menwith Hill spy base will delight and enthrall you. Situated right at the hub of Britain's world-beating telecommunications system, Menwith Hill is one of the secret treasures of American heritage. Hidden away for years, Britons have until now never had the thrill of seeing one of the Seven Wonders of the intelligence world. Menwith Hill Tours offers a tanalising choice of balloon flights and bus tours around this magnificent facility. You'll be amazed at how much you can learn about how much they know about how much you know". It then goes on to describe some of the special attractions: "The Menwith Hill area offers a huge variety of activities for the adventurous visitor. [...] You will be greeted at the front gate by one of the friendly security staff, who will be only too pleased to demonstrate some good old US Army hospitality. Then, after picking yourself off the road, you can take in the wonders of an impromptu exhibition of defence muscle. Ever see a gun at close range? You will! What a treat for the children. At night, Menwith REALLY kicks off. With over 1,200 US intelligence staff, the facility gets down after eight for a rollicking, foot-stompin' time with the local farmers and visitors". Peter.