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.
Yes
The Palace of Westminster
No Big Ben is the main bell (it sounds the hours) in the clock tower situated at the north-eastern end of the Houses of Parliament in the Place of Westminster, London. The Clock Tower is the world's biggest four-faced, chiming clock. Westminster Abby is a church near to the Palace of Westminster but not part of it.
the Great Bell, which is actually Big Ben and 4 chimes
Cheating!
The Peak Tower shopping complex covers an area of 112,000 square feet. However, the measurements of this complex are not listed.
The Willis Tower is 225 feet wide.
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.
of course by lots of feet!