Host Tom Cavanaugh takes viewers beyond the exhibit halls on an insider's tour of private rooms, high-tech vaults, and cutting-edge labs of the Smithsonian, revealing some of the amazing artifacts and rarely seen treasures that visitors can't see.

Get ready for another exciting and exclusive excursion behind the scenes at the Smithsonian Institution. Tom Cavanagh returns for another season of the ultimate insider's tour into the world's most renowned museum complex, unlocking more secrets and a new array of compelling puzzles. From solving mysteries, to saving pop culture and rare animals from extinction, to fascinating stories about the birds and the bees, and more.