Throughout the world, there are ancient structures that defy explanation because even with today's technology they would be nearly impossible to duplicate. How were ancient civilizations able to build such extraordinary structures? And what purpose did they serve?

For centuries archaeologists and explorers have been obsessed with locating ancient cities lost to time. Some of these places are recorded in historical texts, while others are part of oral traditions and folklore. How does a once-thriving community become a lost city? And if their ruins are found, what secrets might be they reveal about human history?

Throughout history, many have claimed to be able to see into the future. These mystics, prophets, and clairvoyants received visions of events that changed the course of history. But what did their prophecies reveal? And what predictions did they make for the future of mankind?

The world is full of stunning displays of natural phenomena that are so spectacular and, at times, so strange they defy conventional wisdom. Can science explain Earth's mysteries? Or does human knowledge of the Earth only scratch the surface?

Every year, thousands of people report looking up at the sky and witnessing unidentified flying objects. A vast majority of these strange and disturbing incidents take place in the same locations on Earth. Is it possible that extraterrestrial spacecraft are repeatedly visiting Earth at so-called "UFO Hot Spots?"

For over 100,000 years, humans have found ways to lay the dead to rest. Graves, tombs, cremations are all considered respectful ways to provide the deceased with a final resting place. But is it possible that some of these practices can preserve the soul for eternity? Or even bring the dead back to life?

Throughout history and across the globe, there have been many sacred relics believed to be imbued with mystical powers. Is it really possible that these ordinary items, like a tooth, or a soldier's spear, can have the ability to perform miracles?

Throughout the world, there have been countless sightings of bizarre creatures that, based on eyewitness accounts, can only be described as monsters, and fearsome beasts that cannot be explained by science. Is it possible that there are terrifying monsters, lurking in the shadows of planet Earth?

Throughout history, every major civilization has believed in curses, and their power to inflict harm on the unsuspecting. Today, many people are still afraid of walking into a cursed place or touching a reportedly-cursed object. But if curses are real then what brings them into existence? And how are they triggered?

Throughout human history, diverse cultures have all used sacred rituals to express their spiritual beliefs. And while some ceremonial practices may appear strange, there are many rituals that are thought to unlock incredible powers. So, is it possible that performing certain acts can connect humanity to a higher plane of existence?