These great movies that came out 15 years ago will make you feel really old

2001 launched a number of hit franchises that are still with us today.

From "Harry Potter" to "The Lord of the Rings," fan bases were thrust into new cinematic worlds and would follow the series through their conclusions and beyond.

As these and other major movie touchstones celebrate their 15th anniversary, we look back at 20 such memorable titles that will make you really appreciate how quick the passage of time is.