This episode argues that Leonardo da Vinci embedded hidden messages in his paintings that point to extraterrestrial influence, with ancient astronaut theorists like William Henry examining works including the *Salvator Mundi*—which sold for a record $400 million in 2017—as pieces of a larger cosmic puzzle. Proponents suggest da Vinci's genius wasn't merely human: his designs for helicopters and tanks centuries before their invention, they claim, reveal contact with a "higher intelligence." Henry travels to Florence to investigate whether da Vinci's art contains codes that could unlock secrets of the universe, proposing that the Renaissance master intentionally concealed knowledge about humanity's extraterrestrial origins within his compositions.
Mainstream art historians and scientists view da Vinci as a polymath whose innovations emerged from keen observation, apprenticeship under Andrea del Verrocchio, and the intellectual ferment of Renaissance Florence—a period characterized by rediscovery of classical knowledge and empirical inquiry rather than alien contact. His technical sketches, while visionary, drew on principles observable in nature and existing engineering concepts of his era. Yet the episode remains compelling because it grapples with a genuine mystery: how one individual achieved such breadth of insight across art, anatomy, engineering, and physics. Whether the answer lies in extraterrestrial intervention or in the extraordinary potential of human curiosity freed from convention—as some suggest da Vinci's illegitimate birth allowed—his work continues to inspire both wonder and investigation.
Château du Clos Lucé, Amboise
France · Medieval Italian
The episode identifies Château du Clos Lucé as the place where Leonardo completed Saint John the Baptist, his final painting, which theorists claim contains a hidden portrait of an extraterrestrial when the image is mirrored and enhanced. Mainstream art historians regard the painting as a late masterwork exploring Leonardo's interest in sfumato and androgynous spiritual imagery.
Louvre Abu Dhabi
United Arab Emirates · Modern
Theorists note that the Louvre Abu Dhabi, which houses the Salvator Mundi, resembles a giant flying saucer with its geometric dome of 7,800 interlocking stars, and question whether its design is intended to signal something beyond mere architecture. The museum's architect Jean Nouvel described his goal as emphasizing the fascination generated by rare encounters.
National Gallery, London
United Kingdom · Medieval Italian
Theorists examine The Virgin of the Rocks at the National Gallery as evidence that Leonardo encoded forbidden knowledge, including the deliberate transposition of Jesus and John the Baptist's protectors and the inclusion of the archangel Uriel — identified as a celestial, possibly extraterrestrial, being — in an otherworldly cavern setting. Mainstream art historians attribute the painting's unusual iconography to apocryphal Christian sources and Leonardo's distinctive compositional innovations.
Piazzale Michelangelo, Florence
Italy · Medieval Italian
William Henry and Dr. Michael Kwakkelstein meet at Piazzale Michelangelo to discuss Leonardo da Vinci's connection to Florence and how the surrounding landscape inspired his paintings. The discussion frames Florence as the birthplace of Renaissance ideas that da Vinci may have used to encode secret knowledge.
Santa Maria delle Grazie, Milan
Italy · Medieval Italian
Theorists argue that Leonardo's Last Supper, housed at Santa Maria delle Grazie, contains hidden messages including a feminine figure identified as Mary Magdalene beside Jesus, the deliberate omission of a Holy Grail chalice, and a musical score encoded in the arrangement of bread loaves and apostles' hands. Mainstream art historians regard the mural as a masterful depiction of the biblical moment when Jesus announces his betrayal, painted for the Dominican monastery.
Uffizi Gallery (Adoration of the Magi), Florence
Italy · Medieval Italian
Using infrared diagnostic techniques in 2002, Dr. Maurizio Seracini revealed that Leonardo's original underdrawing for the Adoration of the Magi depicted an Egyptian temple — capped with a lotus flower representing the Flower of Life — rising through the ruins of a Christian church, imagery that was subsequently painted over. Theorists argue this hidden layer encodes sacred geometry and forbidden knowledge of extraterrestrial origin; mainstream conservators interpret the overpainted layer as a later, non-Leonardine addition obscuring the artist's original intent.
Vinci, Italy
Italy · Medieval Italian
The episode identifies Vinci as the birthplace of Leonardo da Vinci and notes that his illegitimate status — reflected in his surname derived from his hometown — may have freed him from orthodox thinking and allowed him to receive or encode forbidden knowledge.