Brocken, or Blocksberg, the highest peak (3740 ft.) of the Harz Mts., cultivated to the summit; famous for a “Spectre” so called, long an object of superstition, but which is only the beholder's shadow projected through, and magnified by, the mists.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Brochs * Brockhaus, Friedrich Arnold