[3] In 1903,[4] Amos F. Gerald, of Fairfield, Maine, built the castle as a resort, with rooms for around one hundred guests, to encourage travel by trolleycars.

Trolleycars of the Portland & Brunswick Street Railway, of which Gerald was general manager,[7][8] brought visitors from nearby Freeport.

After alighting, they crossed 70 foot (21 m) above Spark Creek on a steel suspension bridge, then climbed steep steps to the hotel's entrance.

[9] The advent of the automobile contributed to the decline of trolley and steamer travel, and the resort closed in 1914 after an eleven-year run.

[11] A photomechanical print of Casco Castle is in the archives of the Metropolitan Museum of Art in New York City.