All investigations related to ancient mysteries.
Angkor Wat is the largest religious monument ever built, but the city around it was even more astonishing. LiDAR scans reveal a sprawling metropolis that collapsed under climate change.
Nearly 900 massive stone statues stand on one of Earth's most remote islands. How the Rapa Nui people carved and moved them remains one of archaeology's greatest puzzles.
Built around 9500 BCE by hunter-gatherers who hadn't invented farming, pottery, or metal tools, Göbekli Tepe is the world's oldest known monumental structure. It shouldn't exist.
Perched 7,970 feet in the Andes, Machu Picchu was abandoned within a century of being built. Its exact purpose, from royal estate to sacred observatory, is still debated.
Etched into Peru's desert over 2,000 years ago, the Nazca Lines depict giant animals and shapes only visible from the air. Who made them, and why?
At 12,800 feet in the Bolivian Andes, Puma Punku's stone blocks were cut with a precision that baffles engineers. How did a pre-Columbian civilization achieve this without metal tools?
Over 2 million stone blocks, precision engineering, and zero blueprints. The Great Pyramid of Giza remains one of history's greatest unsolved construction puzzles.
Built over 1,000 years on Salisbury Plain, Stonehenge's purpose and construction still baffle researchers. From solar calendars to healing shrines, here's what we know.
Teotihuacan was the largest city in the Americas for centuries. It had apartment complexes, massive pyramids, and a population of 125,000. We still don't know who built it or why it collapsed.