No doubt, it's one of the most famous clock in the world. Big Ben is the nickname for the great bell of the clock, which is located at the top of the Elizabeth Tower, on the north side of the Houses of Parliament in Westminster, London. A spectacular piece of architecture, the tower has a height of 316 feet. Although, it's one of the most famous tourist attractions, the interior of the tower is not open to foreign tourists. Anyone who visits the United Kingdom should definitely visit this remarkable place in London.