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In some versions of the tale, Herakles did not know where to travel, and so sought help, being directed to Prometheus to ask, and when reaching Prometheus freed him from his torture as payment. This tale is more usually found in the position of the Erymanthian Boar, since it is associated with Chiron choosing to forgoe immortality and to take Prometheus' place.
In some variations, Herakles, either at the start or at the end of his task, meets Antaeus, who was invincible as long as he touched his mother, Gaia, the earth. Antaeus was killed by placing him above the earth, suspended in a tree.
According to the Greek poet Stesichorus, in his poem the "song of Geryon", and the Greek geographer Strabo, in his book Geographika (volume III), the Hesperides are in Tartessos, a location placed to the south of iberia(Spain).The Greek poet Hesiod said that the ancient name of Cádiz was Erytheia.
Additionally, Hesperides (also called Fortunate Isles) is a name given by the ancients to a series of islands located to the extreme west of the then known world. These may have included the Canary Islands, the Madeira Islands, and Cape Verde.
http://en.wikipedia.org/wiki/Erytheia