The Clock Tower of the Palace of Westminster is the official name for what people often call 'Big Ben'.
You're probably thinking of the Great Clock of the Palace of Westminster, which is in the Clock Tower (recently re-named "Elizabeth Tower"). This clock is often, but incorrectly, called "Big Ben". In fact Big Ben is the largest of the bells in the Clock Tower at the Palace of Westminster.
I think that you mean CLOCK tower!! It's usually known as 'Big Ben'.
Big Ben is the largest bell in the clock tower of the Palace of Westminster (aka Houses of Parliament). The clock tower was built along with the new palace after the old tower and palace were destroyed in 1834.
The whole fortress is formally "Her Majesty's Royal Palace and Fortress of the Tower of London". The keep in the middle is "The White Tower". Other towers that are part of the complex include the Bell, Beauchamp, Devereux, Flint, Bowyer, Brick, Martin, Constable, Broad Arrow, Salt, Lanthorn, and Wakefield Towers, the Bloody Tower, the Well Tower, the Cradle Tower, St Thomas's Tower, Byward Tower, the Constable's Tower, and the Lion Tower.
The Westminster Clock Tower, traditionally known as Big Ben.
The clock tower of the Palace of Westminster (Houses of Parliament), commonly known as Big Ben.
The Palace of Westminster
Big Ben - the world-renowned clock tower that resides in London, England - was built in 1858 after a fire destroyed the old Palace of Westminister. The clock tower was renamed the Elizabeth Tower in 2012 to celebrate Queen Elizabeth's 60th anniversary as queen.
The Palace of Westminster. The clock tower is often referred to (incorrectly) as Big Ben.
The Elizabeth Tower, I think
The Palace of Westminster. The clock and tower is sometimes referred to (incorrectly) as Big Ben.