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The BT Tower is a communications tower located in London. In total it is 191 meters high and was, until 1980, the tallest building of London. Its primary purpose back in the 1960’s, when it was built, was to support the microwave aerials that were used to carry telecommunications traffic from London to the rest of the country.
The tower is still in use but microwave links have been replaced by subterranean fibre optic links. An interesting anecdote is that the tower was designated an offical secret by the parliament and did not appear on any maps until it was officially “revealed” in 1993, some 31 years after being constructed.

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