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Her enigmatic smile has fascinated art lovers for centuries – but could the Mona Lisa really contain a secret message from Da Vinci? New high-resolution images of the Mona Lisa may reveal hidden numbers and letters. Could they be the key to understanding the enigmatic painting? Also, see a grisly find in the oldest subterranean temple in the world.

Following clues in the Old Testament, an archaeologist believes he has discovered the location of the original cities of sin, Sodom and Gomorrah. Go in search of the infamous Biblical cities of sin supposedly destroyed by the wrath of God. Can they be found? Plus, British computer programmer Nick Pelling attempts to crack ‘the most mysterious document in the world’.

Jesuit priest Father Patrick Hough visits Notre Dame Cathedral to examine a relic that's said to be the crown of thorns worn by Christ at his crucifixion. Then head to the mountains of Peru to investigate a hoard of mummies found preserved in disturbing positions.

A mysterious burial 4,000 years ago and the recent discovery of a body with a missing heart leads to a search for the world's oldest vampire. Following the trail of the oldest suspected vampire, and a look into alleged sightings of two alien-like children in an English village.

The archaeological findings of Gobekli Tepe, a Neolithic hilltop sanctuary in Turkey, and the discovery of a series of maimed bodies at a muddy landscape in Ireland.

Ancient languages expert Mark Guscin attempts to shed light on the secrets of what some believe to be Jesus’ shroud by exploring digital analysis of the relic. Investigate what recent advances in science might reveal about this mysterious religious relic since the last time it was tested in 1988. Then, explore the oldest astronomical temple in the Americas.

Examining the medieval myth of the Philosopher's Stone, a Holy Grail-type relic which supposedly held the key to alchemy and immortality. Many noted alchemists and adventurers searched obsessively for the artefact hoping to learn its powerful secrets, a quest which allegedly drove some to madness and others to celestial encounters. It's one of the most coveted artefacts of the Bible: a gold-encrusted chest containing the Ten Commandments. Can modern scholarship explain the awful powers of the Ark of the Covenant and tell us how it vanished and where it is today?

Join underwater archaeologist Guillermo de Anda as he travels across Mexico and Guatemala in search of the legendary Mayan underworld, Xibalba.

After centuries of debate, archaeological evidence unearthed in Bulgaria may reveal not only where the Great Flood happened, but what caused it. Also investigating evidence of what prompted Noah to build his ark. As well as strange standing stones found in Scotland.

Less famous then the Shroud of Turin could the Shroud of Oviedo actually be Christ's burial cloth? NGC traces the blood-stained relic to Israel in a quest to determine whether it holds Christ's DNA, and in a most chilling discovery finds that it contains no evidence of a father's DNA. Later, a linguistic code cracker attempts to solve the riddle of one of the most mysterious ancient objects - the Phaistos Disc. The Phaistos Disc is a curious archaeological find, most likely dating from about 1700 BC. Its purpose and meaning, and even its original geographical place of manufacture, remain disputed, making it one of the most famous mysteries of archaeology. The Phaistos Disc was discovered in the basement of room XL-101 of the Minoan site of Phaistos. The site is near Hagia Triada on the south coast of Crete. Italian archaeologist Luigi Pernier recovered this remarkably intact disc about 15 cm. in diameter and uniformly just over 1 cm. thick, on July 3, 1908.