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St Michael's Cave (Spanish: Cueva de San Miguel) is the name given to a network of limestone caves located in the Upper Rock Nature Reserve of Gibraltar, at a height of over 300 metres above sea level. According to Alonso Hernández del Portillo, the first historian of Gibraltar, its name is derived from a similar grotto in Monte Gargano near the Sanctuary of Monte Sant'Angelo in Apulia, Italy, where the archangel Michael is said to have appeared.
* The Cathedral Cave was long thought to be bottomless, making St. Michael's Cave the subject of one of Gibraltar's most famous legends. It was believed that the cave is one end of a subterranean Ley tunnel over 15 miles (24 km) long which passes under the Strait of Gibraltar. Legend has it that the Barbary Macaques entered The Rock from Morocco this way. * As the Rock of Gibraltar was thought to be one of the legendary Pillars of Hercules, the Ancient Greeks also believed the cave be the Gates of Hades, an entrance to the underworld.