Big Ben, or Big Ben, is the nickname for the clock of the Clock Tower, a bell tower attached to the Parliament Hall. It is a bell tower situated in the north of Parliament Building on the Thames River in London, UK. It has a big bell, named "Big Ben". It is one of the landmarks of London. In 1859, the bell was made by Sir Benjamin Hall, then the British Minister of Works, and it cost 27,000 pounds to cast. The bell tower is 95 meters high, 9 feet in diameter and weighs 13.5 tons. The bell weighs 21 tons and rings every 15 minutes. Every hour, according to Greenwich Time, the bell makes a heavy, clanking sound, and the echo of the bell can be heard miles away. As the symbol of London and Britain, Big Ben is the symbol of London. Everyone who goes to London for sightseeing does not want to go around the Bell Tower and stand on the Parliament Bridge to enjoy the unique architecture of London. Big Ben is huge and gorgeous. The area of four clocks is about two square meters. Big Ben has been announcing the time of London City since 1859, and has been doing so for nearly a century and a half, although it has split twice and been reopened during this period. Now Big Ben's bell still sounds clear and pleasant.