Temple of Hercules Gaditanus
The Temple of Hercules Gaditanus, Temple of Melqart or Temple of Hercules-Melqart was a place of worship in Antiquity in the southern outskirts of Gadir-Gades (current-day Cádiz) perhaps dating as early as the 8th century BC. Operating under Tyrian, Carthaginian and Roman rule, it once was one of the most important sanctuaries in the Western World. It was paid respect by the likes of Hannibal, Scipio Africanus and Caesar. It was initially dedicated to Phoenician god Melqart and then to Hercules. History

In the 1st century BC, Strabo mentioned in his Geographica that the Tyrians founded Gadeira, erecting a sanctuary to Melkart, whom the Greeks and Romans identified with Hercules, on the eastern part of the island, while the city was established on the western part. It was said that the temple had been founded around eighty years after the Trojan War, at the beginning of the 12th century BC. The sanctuary was likely a complex of buildings where the main structure could be accessed through a gateway flanked by two large columns. As described by Silius Italicus in the 1st century BC, the facade featured the twelve labors of Hercules, intricately crafted in bronze. Inside the precinct, there was no representation or statue of the deity. Additionally, it is noted that human sacrifices were forbidden. A perpetual flame burned on its altar, continuously overseen by the watchful presence of its priests. According to Strabo, sailors made their sacrifices on the columns at the entrance of the sanctuary. The sanctuary was adorned with numerous bronze altars depicting scenes from Hercules' life, on which fires constantly burned. Furthermore, the sanctuary was renowned for its two freshwater wells, which had a unique ebbing and flowing pattern, opposite to the tides. According to the Latin historian Pomponius Mela, the temple housed the remains of Hercules, contributing to its immense fame. Moreover, the temple held renowned relics such as the belt of Teucer, a Greek hero and son of Telamon, and the tree of Pygmalion, whose fruits were said to be emeralds. Classical historical sources recount that many renowned individuals, distinguished by their deeds or nobility, visited this temple. Titus Livius narrates that Hannibal arrived at the island to offer his vows to the god before embarking on the conquest of Italy. In this sanctuary, Julius Caesar experienced a prophetic dream that foretold his dominion over the world. This revelation came after he had wept in front of the bust of Alexander the Great, feeling despondent that he had reached the same age without achieving significant success. References 
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Lost buildings and structures
Buildings and structures in the Province of Cádiz
Ancient history of the Iberian Peninsula
Phoenician temples
Roman temples in Spain