The total tour duration is 90 minutes and toilet facilities are available at the beginning and end of the tour only.
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Pollution, asbestos and time have all caused problemsDue to austerity after the war, the repairs were limited and did not fix all the issues. Some of the conservation methods used in the past were not suitable and added to the deterioration of the Tower.
You can visit Big Ben by booking a 90-minute guided tour that takes visitors up 334 stairs to see the clock mechanism room, behind the four clock dials and the Belfry, where the famous bell is located. Tours can be booked by visiting the official UK Parliament website.
At close proximity, the sound of Big Ben measures 118 decibels, which is loud enough to cause physical pain. To make the bell chime, the copper and tin bell is struck by a hammer weighing 200kg.