In the Bible, there are two Arks. Both the Ark of the Covenant and Noah's Ark were built to protect, before they were lost to history. Researchers have been searching for both for centuries.

The quest for immortality has captivated and confounded us for thousands of years. From the healing powers of the holy grail used by Jesus at the last supper, to the elusive Fountain of Youth, and the storied Philosopher's Stone.

Relics from the crucifixion of Jesus Christ have fascinated the faithful for 2000 years--from the wooden cross and iron nails, to the crown of thorns and Spear of Destiny. But do these sacred artefacts still exist? And if so, where are they?

For millennia, there has been speculation about how the world will end. From the detailed account in the Book of Revelation, to the prophecies foretold by Nostradamus, and even the belief in devastation caused by a strange blue star.

The legendary treasures of the Copper Scroll, King Solomon's mines, and the Syamantaka Gem have captivated the world for centuries. But could these vast fortunes still be out there, waiting to be discovered?

Most of the world's holiest places sit in plain sight. But there are some hidden deep underground. Why were they concealed? And what mysteries have we unearthed in these subterranean sacred spaces?