Inspired by an old tale, young mouse Wilfred uses a trip into the hills as an opportunity to look for gold and explore unknown country.

In this book without words, a boy opens a door and invites the reader to explore the magical world on the other side.

"Archer Helmsley's grandparents have finally returned home, but there are rumors they've brought a curse with them"--

Professor Hardwigg, his nephew Harry, and their guide Hans explore a volcanic crater in Iceland that leads them to the center of the Earth and to incredible and horrifying discoveries.

The Thea sisters continue the search for the seven ancient treasures, using the clues found in Aurora Beatrix Lane's travel diary to find a fabulous emerald which once belonged to Cleopatra--a quest that leads them from Moscow, to the Sahara, and finally Bolivia.

Awakened gently by Sun, Sailor sets off to explore new lands where he meets Fisher, and although they speak and dress differently, they find they have much in common. Includes author's note about the first encounter between a European explorer and a Native North American.

Stella Starflake Pearl, Ethan, Shay, Beanie, and Percifal set out for Witch Mountain, where a fearsome witch has taken Stella's father, Felix.

"Amid assignments that take the Explorer Academy recruits from the iceberg-filled waters of Antarctica to the bone-dry deserts of Argentina, Cruz Coronado is scrambling to complete the last piece of the cipher. With Nebula agents and the elusive explorer spy still out there, his opportunity to recover his mother's world-changing formula is slipping away. But as Cruz has learned from his time aboard Orion, true explorers must never give up. Even after...

"Stella Starflake Pearl just wants to be part of the Polar Bear Explorers Club. But Stella's a girl, and everyone knows that girls aren't allowed to be explorers. Stella's ready to prove everyone wrong"--

Kit, Zander, and M. K. West are settling into their new lives as students at the Academy for the Exploratory Sciences when Kit finds another mysterious map left for him by their father, the brilliant, famous--and presumed dead--explorer Alexander West. Why did Alexander leave the maps behind, and why are government agents so determined to seize them? What is really going on in a mysterious and unknown stretch of the Caribbean, famous for its violent...