History is waiting to be discovered.

These explorers set out with high hopes, but were never seen alive again.

Explore one of America's national treasures.

You can live vicariously through these gorgeously illustrated travel books.

Dive into the unknown with these books about marine life.

These underground tunnels house the remains of over six million people.

Temperatures dropped below −70 °F on the grueling journey.

In the face of death, these ordinary citizens did extraordinary things.

Venture below the surface for our planet's most spectacular views.

The crew and their belongings had disappeared for good.

The explorer's disappearance continues to fascinate.

Across the unforgiving landscape of Antarctica are deserted outposts haunted by the ghosts of the past.

They set off into uncharted territory and were never seen again.