London
of Westminster in London, and is often extended to refer to the clock or the clock
tower as well.Big Ben is the largest four-faced chiming clock and the third-tallest free-
standing clock tower in the world. It celebrated its 150th anniversary in May 2009 (the
clock itself first ticking on 31 May 1859),during which celebratory events took place. A
clock tower was built at Westminster in 1288, with the fine-money of Ralph Hengham, Chief
Justice of the King's Bench.Despite being one of the world's most famous tourist
attractions, the interior of the tower is not open to the general public due to security
concerns, although from time to time press and other VIPs are granted access.
However, the tower has no elevator, so those escorted must climb the 334 limestone
stairs to the top.Because of changes in ground conditions since construction (notably
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