England's Stonehenge and the Moai statues of Easter Island have inspired awe for centuries. We marvel at their ambitious construction and at the determination of the people who built them. But will we ever fully understand how and why these ancient sacred structures came to be?

Most of the world’s holiest places sit in plain sight, able to be seen and experienced. But there are some hidden deep underground. The revered tomb of Jesus Christ, a secret Knights Templar tunnel, and a prehistoric temple in Malta with mystical properties–why were they concealed? And what mysteries have we unearthed in these subterranean sacred spaces?

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 artifacts 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. Could any of these predictions come true? And if so, when?

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?

In the Bible, there are two Arks, each designed by God himself. 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. Did either exist, and if so, where could they be?

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. Can these long sought after relics grant the power to live forever? And if so, where could they be?

Ancient cultures around the world have aroused fascination, and provoked fear with curses and objects used to conjure them like rings, tablets, and stones. But is there proof that some might have actually worked?