In the winter of 1923, Edward Leedskalnin, a small, sickly man, stepped out of the Florida sun and onto a patch of coral bedrock, as though he had finally reached the end of a long and mysterious pilgrimage.

In time, he would carve that ground into a place so strange and improbable that—if the whispers are to be believed—could only have been built with the aid of otherworldly powers...

Written by Neil McRobert and Richard MacLean Smith.

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Season 09 Episode 04: To Each Man His Castle (Pt. 1)