Machu Picchu: The Lost Civilization

Where is the Bermuda Triangle?

The Boy Who Harnessed the Wind: Young Readers Edition

What Do We Know About Bigfoot?

What Is the Story of the Headless Horseman?

Who Were Stanley and Livingstone?

What Do We Know About the Mystery of D. B. Cooper?

Thor Speaks!: A Guide to the Realms by the Norse God of Thunder

What Is the Story of Cinderella?

Hades Speaks!: A Guide to the Underworld by the Greek God of the Dead

What Do We Know About Crop Circles?

What Do We Know About the Chupacabra?

What Do We Know About Atlantis?

What Do We Know About the Winchester House?

What Do We Know About the Yeti?

The Great Penguin Rescue: Saving the African Penguins

Can Lightning Strike the Same Place Twice?: And Other Questions about Earth, Weather, and the Environment

What Do We Know About the Nazca Lines?

What Do We Know About Alien Abduction?

What Do We Know About the Kraken?