Season 1
S1.E1 ∙ Evil PlacesS1.E2 ∙ Mysterious StructuresS1.E3 ∙ Strange CreaturesS1.E4 ∙ Unnatural NatureS1.E5 ∙ Bizarre RitualsS1.E6 ∙ Life Beyond DeathS1.E7 ∙ Mysteries of the MindS1.E8 ∙ Incredible SurvivorsS1.E9 ∙ The Oak Island CurseS1.E10 ∙ Dark PropheciesS1.E11 ∙ Lost CivilizationsS1.E12 ∙ Deadly CultsS1.E13 ∙ Extreme Weather MysteriesS1.E14 ∙ Mysterious StonesS1.E15 ∙ Vampires and WerewolvesS1.E16 ∙ Amazing Animal Abilities
Season 2
S2.E1 ∙ The Greatest EscapesS2.E2 ∙ Superhuman SensesS2.E3 ∙ Mysterious CursesS2.E4 ∙ The Truth About UFO'sS2.E5 ∙ The Underground WorldS2.E6 ∙ Leading Double LivesS2.E7 ∙ Mysteries of the BibleS2.E8 ∙ Mysterious MummiesS2.E9 ∙ Secrets of America's MonumentsS2.E10 ∙ The Search for AtlantisS2.E11 ∙ Extraordinary EngineeringS2.E12 ∙ The Power of GoldS2.E13 ∙ The Truth About BigfootS2.E14 ∙ Bizarre VanishingsS2.E15 ∙ Serial KillersS2.E16 ∙ The Mystery of PlaguesS2.E17 ∙ Mysteries of the MoonS2.E18 ∙ Outrageous Robberies
Season 3
Season 4
S4.E1 ∙ Mysterious Ancient RuinsS4.E2 ∙ The Mystery of GeniusS4.E3 ∙ What Lies Below?S4.E4 ∙ Secrets of Abandoned PlacesS4.E5 ∙ Acts of GodS4.E6 ∙ Serial Killer CreaturesS4.E7 ∙ Mysterious TombsS4.E8 ∙ Uncanny CursesS4.E9 ∙ Superhuman FeatsS4.E10 ∙ Mysteries of the Missing LinkS4.E11 ∙ Surviving the ImpossibleS4.E12 ∙ The Search for King ArthurS4.E13 ∙ Wonders of the Ancient WorldS4.E14 ∙ The Hunt for Jack the RipperS4.E15 ∙ The Search for Extraterrestrial LifeS4.E16 ∙ Real Life MonstersS4.E17 ∙ America's Lost TreasuresS4.E18 ∙ The Bermuda Triangle and the BeyondS4.E19 ∙ Secrets of the Founding FathersS4.E20 ∙ The Weird Wild WestS4.E21 ∙ Devastating DisastersS4.E22 ∙ Mysterious Monoliths