It was a series from Spanish TV that Netflix picked up, and I noticed my ancient high-school Spanish returning as I "read along". It helps that I read quickly, so I could simultaneously listen and read. One thing that I noticed was that sometimes the English translation was more a transliteration taking into account Anglophone sensibilities, like translating "puta" as "bastard".

Enjoyable show, BTW. Spain's answer to Dr. Who envy--a government Ministry possessing a time travel circular stairway, descending down a pit back in time. No crazier than a blue police box. One of the threads of the show, given all the travel through Spain's past, is what it's like in the present to live in a failed Empire. Memories of a past that was sometimes glorious, sometimes embarrassing, like the Revolution, a lot of rueful shrugging. Perhaps some clues to America's future post-Trump.