There are 10 attractions at Magic Kingdom we rate as "Not To Be Missed":

Not To Be Missed at Magic Kingdom
Adventureland Pirates of the Caribbean
Fantasyland Mickey's PhilharMagic
Peter Pan's Flight
Seven Dwarfs Mine Train
Frontierland Big Thunder Mountain Railroad
Splash Mountain
Liberty Square The Haunted Mansion
Main Street, U.S.A. Once Upon a Time
Wishes Nighttime Spectacular
Tomorrowland Space Mountain

Not To Be Missed Attractions at Other Parks