Task: Question Answering
Input (English): Passage: Gibraltar's appearance in prehistory was very different. Whereas today it is surrounded by sea, the water level was much lower in prehistoric times, when the polar ice caps were larger. The current peninsula was surrounded by a fertile coastal plain, with marshes and sand dunes supporting an abundant variety of animals and plants.Neanderthals are known to have lived in caves around the Rock of Gibraltar; in 1848 the first known adult Neanderthal skull, and only the second Neanderthal fossil ever found, was excavated at Forbes' Quarry on the north face of the Rock. Had the skull been recognised for what it was, the species might have been named Gibraltarians rather than Neanderthals. The date of the skull is unclear but it has been attributed to around the start of the last glacial period about 50,000 years ago.More Neanderthal remains have been found elsewhere on the Rock at Devil's Tower and in Ibex, Vanguard and Gorham's Caves on the east side of Gibraltar. Excavations in Gorham's Cave have found evidence of Neanderthal occupation dated as recently as 28,000–24,000 years ago, well after they were believed to have died out elsewhere in Europe. The caves of Gibraltar continued to be used by Homo sapiens after the final extinction of the Neanderthals. Stone tools, ancient hearths and animal bones dating from around 40,000 years ago to about 5,000 years ago have been found in deposits left in Gorham's Cave. Numerous potsherds dating from the Neolithic period have been found in Gibraltar's caves, mostly of types typical of the Almerian culture found elsewhere in Andalusia, especially around the town of Almería, from which it takes its name. There is little evidence of habitation in the Bronze Age, when people had largely abandoned the tradition of living in caves. 
Question: What are the names of the locations on Gilbraltar where Neanderthal remains have been found?
Output (English): Ibex.