Ghosts in North America

Where is the Bermuda Triangle?

Ghosts in Europe

What Do We Know About Bigfoot?

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

What Is the Story of the Headless Horseman?

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

Can an Old Dog Learn New Tricks?: And Other Questions about Animals

What Do We Know About the Chupacabra?

What Do We Know About Alien Abduction?

What Do We Know About the Nazca Lines?

What Do We Know About Crop Circles?

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

What Do We Know About the Kraken?

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

What Do We Know About the Winchester House?

What Do We Know About Atlantis?

What Do We Know About the Roswell Incident?