Conspiracy Thrillers

Hello there.

I'm new to this subreddit, but I was hoping you guys could help me. I'm a huge fan of conspiracy thrillers, including those that involve ancient societies and a certain mystery.

Works such as the X-Files, Captain America: The Winter Soldier, Angels & Demons and the Da Vinci Code, National Treasure.

I, unfortunately, don't know many books of that genre. I recently started reading some James Patterson books, as I like those, too, but I don't know much about many other books of the genre I described.

Do you guys have any suggestions? Thanks and thank you for your time.