All movies and series in the Marvel Cinematic Universe.
Trying to keep it up with the event chronology on http://marvelcinematicuniverse.wikia.com/ . Not completely covered yet (estimated guesses): The Punisher, Agents of S.H.I.E.L.D. S5, Black Panther, Jessica Jones S2, Avengers: Infinity War, Ant-Man and the Wasp, Cloak and Dagger, Captain Marvel.
NOTE: This is not a watching order, but a chronological order.