Traveling north across the planet, eventually, you'll run out of forest, a land too harsh for even trees to take root.

Traveling north across the planet, eventually, you'll run out of forest, a land too harsh for even trees to take root.

Stonehenge is one of the world's greatest mysteries.

During World War II, 60% of Japanese forces were lost due to starvation and disease.

Mark Lawson talks to actress Liz Smith about her life and career.

Around the world, a new generation of astronomers are hunting for the most mysterious objects in the universe. Young stars, black holes, even other forms of life.