From radio broadcasts about alien invasions to global health crises, history is filled with moments of widespread fear. Join us as we examine the events that sent humanity into a collective panic! Our countdown includes the Y2K scare, Chernobyl disaster, COVID-19 pandemic, and more! Which historical moment of panic do you remember most vividly?

We’ve come to expect the mass hysteria and frenetic hype around certain movies, which makes the decision of these filmmakers to keep it quiet all the more surprising. For this list, we’re taking a look at films that were intentionally kept either mostly or totally under wraps from the public eye. Our countdown includes films such as “A Ghost Story” (2017), “The Cove” (2009) & “Escape from Tomorrow” (2013). Did YOUR favorite film that was shot in secret make the list? Let us know in the comments!