One of the world’s greatest ancient enigmas, the Nazca lines are a dense network of criss-crossing lines, geometric shapes, and animal figures...

Orange-and-black wings fill the sky as NOVA charts one of nature's most remarkable phenomena: the epic migration of monarch butterflies across North...

Scientists have struggled for centuries to pinpoint the qualities that distinguish humans from the millions of other animal species with which we...

Dated to the late Stone Age, Stonehenge may be the best-known and most mysterious relic of prehistory. Every year, a million visitors are drawn to...

A young astronaut works in solitude on a spaceship, trying to avoid reminders of her life back on Earth. When an alien entity finds its way aboard...

NOVA takes you inside the operating room to witness organ transplant teams transferring organs from donors to recipients. Meet families navigating...