What is your favorite period film and why?

My first experience to period pieces was with Robert Altman's Gosford Park. I did not particularly care for it, but someone told me how to watch period dramas. Most of the time they're slow, so she told me to savor the costumes, sets, photography and music.

Now that I've acquired that taste, some of my favorite films are period pieces.

Here are a few I like:
Amadeus Milos Forman 1984
Barry Lyndon Stanley Kubrick 1975
Ben-Hur William Wyler 1959
Days of Heaven Terrence Malick 1978
Kagemusha Akira Kurosawa 1980
Ran Akira Kurosawa 1985
Seven Samurai Akira Kurosawa 1954

What are your favorite period pieces? Barry Lyndon, for me, is the difinitive period epic that marked a change in how they were done (by the inimitable Stanley Kubrick), and, while very slow, is very much - for lack of better words - "an uncompromised artistic vision" (Richard Schickel). By changed, I mean from the "Hollywood" look of the 1950s to the soft, modern look achieved by new Carl Zeiss lenses for shooting in natural light. It's one of the best films of the 1970s.