A Gothic-style “castle” that towers over a bluff in Cape Elizabeth is for sale with an asking price of $3.35 million. Beckett’s Castle – built of quarried stone and host to decades of ghost tales – was placed on the market this month following a summer auction that emptied the landmark home’s contents. Completed in 1874, Beckett’s Castle was built for use as a summer cottage by lawyer and author Sylvester Blackmore Beckett, a major figure in mid-19th century Portland history.