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As people have mentioned here, wandering bookstores and libraries are excellent ways to get out of a filter bubble. That's exactly what we're simulating at Peruse.
EDIT for reference, I'm the one who recently posted on this topic, because it's an issue I've been having too: https://news.ycombinator.com/item?id=9458829
Do mathematics. Good luck.
Learn a a new language.
Learning a new language isn't just reading and writing some stuff in a different way. It exposes you to new TV programmes, new styles of music, new fashions and fads. You'll see different kinds of politics, where the duopoly of Liberal/Conservative simply doesn't apply. A different view on history. Different ways of separating people than "race" and different ways of grouping them together than rich or poor.
While the other suggestions have merit, I don't think any of them almost literally open up a whole new world to you the way learning a language does. It will help you view your own culture in a new way too.
[similar applies to computer languages ;-) ]
Quit your job. Drop LSD repeatedly over the course of a week. Stop reddit usage (reddit is a watering hole for morons). Learn LISP (it is more of a trip than acid). Find controversial people, read and understand their viewpoint. Do mathematics. Good luck.
Go to the library. (Yes, the place with all the books. ;-) ) Wander through the nonfiction section and scan the titles. If anything catches your eye, pick it up and read the first couple pages. If it seems at all interesting, check it out and read it. This technique is responsible for my reading in depth about the history of shipping containers, learning just a little bit about how to do interior design, and reading…
I got some serious depression when I got to the point of non-expanding (if you can name it like that).
I sold out all my business, throw a glow on everything else. Went full blown bankrupt. Do not drag your family in to this, it is lone journey. I went to very close of zero - barely possible to afford food. Rewritten myself and started from the beginning. It is amazing how you can rewrite yourself when back to basics.
6 months it took me to rewrite all the "downs" and once I started business it took me 2 weeks to earn as much as in last 6 months. Now everything is so much easier.
Harper's dictionary of classical literature and antiquities, https://archive.org/details/harpersdictiona00peckgoog
David Rumsey Map Collection (includes old "maps" of human knowledge, today could be called infographics), http://www.davidrumsey.com
The Ancient Engineers, by L. Sprague de Camp, http://www.amazon.com/The-Ancient-Engineers-Sprague-Camp/dp/...
Oxford English Dictionary, 1888 Edition, 15000 searchable pages as a Windows app, https://archive.org/details/oed11_201407
Also regarding books - try to find books that abstract the patterns out of a field, since it's a useful way to maximize learning - and having everything in a format that's easy to use in the future(problem -> pattern).