History's most enduring mysteries and legends involve tales so incredible that they blur the line between fact and fantasy. This nonfiction series for age 12 and up examines current evidence surrounding Bigfoot, alien activity, and other mythical creatures and sites, as well as related conspiracy theories, cover-ups, hoaxes, and famous sleuths. The truth is out there--uncover it! Since ancient times, fishermen have spun tales of giant sea monsters, tentacled beasts that capsized ships and drowned countless sailors. Most of these mythical creatures are now known to have been based on real animals, such as giant squid and octopuses. Some were hoaxes. But what about the others? Marine scientists seek the truth by exploring the ocean depths, while pop culture spins more fantasies. For readers age 12 and up, this title investigates the phenomena surrounding sea monsters, from historical accounts and popular myths to hard facts and evidence. Includes a glossary, index, sidebars, and further resources.