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The Rupes Nigra ("Black Rock"), a phantom island, was believed to be a black rock located at the Magnetic North Pole or at the geographic North Pole itself. Described by Gerardus Mercator as 33 French miles in size, it provided a supposed explanation for why all compasses point to this location.
Inventio Fortunata (also Inventio Fortunate, Inventio Fortunat or Inventio Fortunatae), "Fortunate, or fortune-making, discovery", is a lost book, probably dating from the 14th century, containing a description of the North Pole as a magnetic island (the Rupes Nigra) surrounded by a giant whirlpool and four continents.
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Major structures, from left to right: Hotel Riu Plaza España, VP Plaza España Design, Palacio Real and, behind it, the Catedral de la Almudena. Date Taken on 5 September 2020, 21:22:40
Rupes Nigra: 14th century: A magnetic, black island at the exact Magnetic North Pole, invented as an explanation for why all compasses point north. Sandy Island: 1774: Another phantom, small island to the west of New Caledonia that was recorded on many maps until 2012, when a surveying ship passed by and disproved its existence.
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Dermatosis papulosa nigra, a condition of many small, benign skin lesions on that face that closely simulate seborrheic keratoses, a condition generally presenting on dark-skinned individuals; Linea nigra, a dark vertical line that appears on the abdomen during pregnancy; Substantia nigra, a portion of the brain associated with dopamine production
It is located on a 148-hectare (370-acre) estate, which is in private hands. It is one of the most significant Herrerian monuments in the Community of Madrid and, at the same time, the most unknown. It was designed by Juan Bautista de Toledo, following the model used in the Casa de Campo in Madrid. [6] [7]