If you have an Amazon Prime membership, you can stream "The Pillars of the Earth" for free. Amazon Prime Video offers all eight episodes of the series, and you can even download them for offline viewing. If you don't have a Prime membership, you can sign up for a free trial and watch the series during that time.

Many public libraries offer free access to streaming services like Kanopy or Hoopla, which may carry "The Pillars of the Earth." If you have a library card, you can sign up for these services and watch the series for free.

While it's unlikely that you'll find all eight episodes of "The Pillars of the Earth" on YouTube for free, some users may have uploaded individual episodes or clips. However, be aware that these uploads may be taken down at any time, and the video quality may be poor.