This is the so-called “Mask of Agamemnon” discovered by Heinrich Schliemann, the German adventurer and archaeologist. It was discovered in the grave circle on the acropolis of the site of ancient Mycenae in Greece.
This golden face was discovered in a royal tomb by Schliemann, who imagined it to be the face of Agamemnon. Agamemnon ruled Mycenae during the time of the Trojan War and was married to Helen (who “launched a 1000 ships”). The tomb the mask was found it is probably not the tomb of Agamemnon, though. This golden object and many others are housed in the Archaeological Museum in Athens. It is well worth the visit if you are in Athens.