Not only has it become a cult classic over the years, it has become a classic classic. Here is a brief documentary about everything you need to know about the film Groundhog Day, starring Bill Murray and written by Harold Ramis and Danny Rubin.
Produced and written by Matt Beat. All images and video used under fair use guidelines.

Sources used:
http://www.locationshub.com/blog/2013...
https://chicago.curbed.com/2017/2/2/1...
https://en.wikipedia.org/wiki/Groundh...)
http://www.imdb.com/title/tt0107048/
http://uproxx.com/movies/thestorybe...
https://www.rottentomatoes.com/m/grou...
http://mentalfloss.com/article/55243/...
http://www.pepweb.org/document.php?i...
https://www.vice.com/en_us/article/ez...
http://www.filmdetail.com/2011/02/02/...

Photo credits:
Anthony Quintano https://www.flickr.com/photos/quintan...
https://commons.wikimedia.org/wiki/Fi...
https://www.flickr.com/photos/quintan...
https://www.flickr.com/photos/quintan...
Doug Kerr https://www.flickr.com/photos/dougton...
Jon Dawson https://www.flickr.com/photos/jmd4128...