The What Do We Know About? series explores the mysterious, the unknown, and the unexplained. Why was Sarah Winchester's puzzling mansion built with so many mysterious features? And is it truly haunted?

In 1884, Sarah Winchester began building a large mansion in Santa Clara County, California. Under Sarah's direction, the house rose to be seven stories high and filled with mysterious features, including stairs that lead to nowhere and windows that look into other interior rooms. The house is more than just oddly designed, however: Many people believe that it is haunted. What made the heiress to the Winchester rifle fortune, an independent woman in many ways ahead of her time, create such an unusual house? Is it really filled with ghosts and spirit energy? Find out more in this nonfiction title about one of America's most famously unexplainable and possibly haunted houses.

Find out what really happened when an entire colony disappeared in 1590, just five years after it was founded. What is the truth about the missing members of the lost colony of Roanoke?

In 1585, Sir Walter Raleigh attempted to found the very first permanent English settlement in the Americas. The initial settlement—called the Lane colony—failed due to extremely low supplies and a hostile relationship with the Native American people who were already living on the land. Despite this miserable first attempt, Raleigh decided to establish another settlement. Over one hundred people agreed to join this new colony on Roanoke Island, just off the coast of what is now North Carolina. The colony's governor, John White, chose to return to England to get more supplies but found himself stuck there for three years due to an unexpected war. When he arrived back at Roanoke, the entire colony had vanished. Over one hundred people, including his wife and daughter, had seemingly disappeared. They were never heard from again. The only clue left was the word "Croatoan" carved into a post. What really happened to the missing English settlers? Find out what we do know about this historic unsolved mystery in this nonfiction book for young readers.