Colossal explosions shake a remote corner of the Siberian tundra, leaving behind massive craters

Renowned paleontologist Kirk Johnson takes us on an epic adventure through time at the polar extremes of our planet.

Explore key military technologies in the American colonies’ fight for freedom.

Witness an unprecedented feat of engineering: the construction of the International Space Station, a habitable space lab hurtling around Earth at 17,000 mph.

Find out why deadly flash floods are on the rise and how we can protect ourselves from them.

Explore mysterious 9,000-year-old Stone Age megastructures found in the Arabian Desert.

Discover how two revolutionary ancient inventions changed the course of humanity forever.

Follow ancient humans’ journey into an icy and perilous new land.

Discover how Homo sapiens outlasted Neanderthals – and how they helped make us who we are today.