President Donald Trump’s ongoing battle with special counsel Robert Mueller. The rivalry between Saudi Arabia and Iran. The resurgence of violent white supremacists in America. Facebook’s impact on privacy and democracy.

Throughout 2018, FRONTLINE has investigated a wide range of stories about our country and our world — from Riyadh to Myanmar to D.C. to Charlottesville.

As the year draws to a close, we’re counting down the 10 FRONTLINE documentaries that have earned the most streams* so far in 2018 — and collecting them all in one place, for easy viewing.

Every day from now through Dec. 23, we’ll reveal a different documentary on the list — starting with No. 10, and ending with No. 1. We’ll also share related reporting on each topic as we go.

We hope you’ll bookmark this link and check back daily as the countdown unfolds. Click each image to learn more about (and watch) each documentary on the list.

*About This List: The list was determined by the number of PBS video player streams of FRONTLINE films from Jan. 1, 2018 through the start of this countdown. The tallies do not include views on Facebook, YouTube, or Twitter. In the case of two-part documentaries, we combined streaming numbers for each part.