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Elizabeth Tower (Big Ben), London

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Contact: +44 20 7219 3000
Open Hours: Tours: Daily M-F 9:15a, 11:15a, 2:15p; Book in advance
Big Ben is the name of the clock inside the famous tower that also forms part of the Houses of Parliament , but also extends to the entire structure that was renamed Elizabeth Tower in 2012. Its impressive mechanism weighs in at over 5 tons, and the pendulum, which beats once every two seconds, weighs 203 kilograms (447.53 pounds). The clock was named Big Ben after the First Commissioner of Works, and since 1885 a light above it has been lit while the House of Commons is in session. Residents can schedule a time to climb the clock tower. Unfortunately, non-citizens are not permitted to climb the clock tower.