Every season of The Last Unknown ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of The Last Unknown!

Ian Shive leads a risky expedition into a remote Alaskan wildlife refuge.

The Aleutian Islands

Ian explores one of Earth's most well-protected coral reef ecosystems.

Palmyra Atoll

Ian joins a team of scientists to unlock vital new info about coral reefs.

Rose Atoll

Ian explores one of America's least-known national parks.

The Channel Islands

Nature Photographer Ian Shive uncovers the mysteries of America's unexplored National Wildlife Refuge System and one of the least known national parks.

The Best Seasons of The Last Unknown

The Best Seasons of The Last Unknown

Season 1