They are some of the biggest pyramids on the planet, millions of tons of stone and earth towering above the landscape in a display of massive wealth and power. But it wasn't the pharaohs that built these pyramids. This is the majestic ancient city of Teotihuacán, Mexico, home to one of the most powerful civilizations of its time. But why, around 750 AD, did the advanced civilization that created Teotihuacán suddenly vanish? The identities of its founders, the language they spoke and even the original name of the city are all unknown. DNA analysis of bodies from Teotihuacán shows they weren't Mayan, Incan or Aztec, but an entirely different civilization. It was assumed to have been a peaceful, utopian society, but the latest discoveries are revealing a much darker scenario. In the depths of Teotihuacán's pyramids, experts have uncovered vault after vault filled with curious human remains.

For most of America's history, sacred buildings represented our greatest feats of innovative engineering and artistic design. Unlock the elements of design that make these structures so fascinating and unveil the meaning in religious architecture, ranging from grand cathedrals and simple country churches to synagogues and mosques.

A man named Cukik trapped in a paradoxical dream about the man he is watching on his laptop. This madness was contagious even to the mysterious man in his dreams.

Through their fieldwork, scientists bring to life a lost and unknown chapter of ancient Egypt, and write the next of the greatest adventures in the history of archaeology.

With everything that we've got going on every day, how many of us ever think about our breathing, about the meaning of breathing? Yet, for thousands of years, people have understood that our physical breath is a picture of a deeper spiritual reality. In the Bible, the word for "breath" is the same as the word for "spirit." There's an inherent dilemma at the core of what makes us human. We've all been created in the image of God and possess immense power and strength. And at the same time, our lives are incredibly vulnerable and fragile. Maybe if we had more insight into the meaning of breathing, we would better understand how God created us as human beings.