As of July 2009, Willis Tower is the tallest building in the United States and the fifth-tallest freestanding structure in the world.
The New Century Global Center is the world's biggest freestanding building.
There is no biggest prime number: they go on for ever.
There is no such thing as a biggest fraction, for the same reason that there is no biggest number. For example, if you have a large (finite) number, you can always add 1 to it to get an even larger number.
the worlds biggest yoyo is about the size of a hobo
The Amazon is the worlds biggest rain forest
The Catholic Church is the biggest charity in the worlds.
Since numbers don't stop, there is no largest one.
Coca Cola is the biggest selling soft drink in the World.
The worlds biggest island is clearly Green Land its PNG
The worlds biggest selling drink is both Milk and water.
The worlds biggest tin sheep here
the worlds biggest volcano is Mauna Lao is in Hawaii