S21 E1: The Top Ten Extraordinary Discoveries

S21 E2: The Top Ten Mysterious Monoliths

S21 E3: The Top Ten UFO Crashes

S21 E4: The Top Ten Unexplained Technologies

S21 E5: The Top Ten Secret Projects

S21 E6: The Top Ten Mysterious Mountains

S21 E7: Mysteries of the Aztecs

S21 E8: The Glowing Orb Phenomenon