I think that it is probably Cerberus, the three headed dog of the underworld. Heracles (the Greek version of Hercules) has to go into Hades to chain the dog as one of the challenges set him by Hera, Zeus' wife. Cerberus has been immortalised through this myth, through Dante's Inferno and through various modern takes such as Fluffy, the three headed dog guarding the Philosophers Stone in the first Harry Potter book and Cerberus in Devil May Cry 3.
There are many Greek monsters in mythology; the favorites and most famous very over from ancient to modern time.
The Kraken.(is Greek) or Godzilla Kapa
hydra
Delphi was the site of the most famous of the Greek oracles.
what was Apollo greek god most famous for
Bigfoot, The Loch ness monster, and aliens.
The most famous Greek building is probably The Parthenon which is located on the Acropolis in Athens.
Godzilla
The most famous of all Greek plays were Drama and Satire/comedies. The most famous of Greek playwrights was Homer and Socrates.
Some of the most famous Greek statues and sculptures are "Athena" and "Zeus."
Aristotle and Plato are the two most famous Greek philosophers. Other famous Greek philosophers include Parmenides, Diogenes, and Cleanthe.
The most famous of the early mapmakers was a Greek geographer named "Ptolemy"A+