In the summer of 1817, a mysterious creature was seen swimming in the harbor of Gloucester and along the coast of Cape Ann. Eyewitnesses described it as a gigantic, serpent-like animal, its long body marked by a series of humps rising and falling above the water. Throughout that summer and into the following year, numerous fishermen and other credible locals reported sightings of the creature, capturing the imagination of scientists, newspapers, and the public alike. The Gloucester Sea Serpent quickly became a legend and remains one of the most well-documented cryptid sightings ever recorded.

A contemporary illustration of the Gloucester Sea Serpent.
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