The Great Wall of China (S05E15)

S05E01 UFO Coverups S05E02 Faith Healing S05E03 Lee Harvey Oswald S05E04 Daredevil Death Wish S05E05 Life After Life (aka Out of Body Experiences) S05E06 Moon Madness S05E07 Dangerous Volcanoes S05E08 The Lindbergh Kidnapping S05E09 Acupuncture S05E10 Jimmy Hoffa S05E11 Fountain of Youth S05E12 Laugh Therapy S05E13 Salem Witches S05E14 Super Children S05E15 The Great Wall of China S05E16 The Castle of Secrets (aka Coral Castle) S05E17 Great Lovers S05E18 The Holy Grail S05E19 The Death of Marilyn Monroe S05E20 Chinese Explorers S05E21 The Hindenburg Mystery S05E22 The End of the World S05E23 The Lusitania S05E24 Sun Worshippers