What does a US 100 dollar bill look like and is there a 100 dollar bill?

There's very definitely a United States 100 dollar bill. Since 1969 it's been the highest denomination of paper money in the US.

The $100 bill is otherwise known as a "Benjamin" because the obverse of the bill has a portrait of Benjamin Franklin. It features a picture of Independence Hall on the reverse of the bill, though the clock is incorrectly depicted as having IV as 4 on the clock face, rather than IIII as in the real-life version.

The $100 bill is one of only two currently-circulated US banknotes featuring a portrait of an individual who was not US President. The other is the familiar ten-dollar bill which carries a picture of Alexander Hamilton, the first Secretary of the Treasury.