Some of the most mysterious monsters and mythical creatures that may inhabit this earth, including vampires, Bigfoot and the Loch Ness Monster.

Some of the world's most sacred sites, including the Great Pyramid of Giza, Chartres Cathedral and Masjid Al-Haram.

People who defy the laws of physics and perceptions of reality, from exceptional feats of endurance and miraculous recoveries to psychic abilities and exorcisms.

Mysterious writings, images and relics from the past, including the Nazca Lines, the Voynich Manuscript and the Crystal Skulls.

Paranormal phenomena that baffles experts around the world, from ghostly encounters and spectral curses to spontaneous combustion and the mysterious Hum.

A closer look at the awe-inspiring structures that capture imaginations, including the Olmec Heads of Central America, the Alhambra in Spain and Angkor Wat in Cambodia.