Thousands of artefacts from the British Museum's priceless collections have gone online in a partnership with Google that will allow web-users to take a virtual stroll through its galleries. The deal with the Google Cultural Institute, which has 800 partners from over 60 countries, also allows objects to be scrutinised by researchers around the world thanks to high-definition Gigapixel technology.

From the basement to the fifth floor, the British Museum has opened its doors to Google's Cultural Institute to create a Street View version of the museum. More than 4,500 items from the museum's collection have been photographed and are available to be seen on a virtual walkthrough of the historic corridors. Descriptions of many of the items including the dates they were created have been included alongside the collection.

The Department of Greece and Rome at the British Museum has one of the most comprehensive collections of antiquities from the Classical world, with over 100,000 objects. These mostly range in date from the beginning of the Greek Bronze Age (about 3200 BC) to the reign of the Roman emperor Constantine in the fourth century AD, with some pagan survivals.
The Cycladic, Minoan and Mycenaean cultures are represented, and the Greek collection includes important sculpture from the Parthenon in Athens, as well as elements of two of the Seven Wonders of the Ancient World, the Mausoleum at Halikarnassos and the Temple of Artemis at Ephesos.
The department also houses one of the widest-ranging collections of Italic and Etruscan antiquities and extensive groups of material from Cyprus. The collections of ancient jewellery and bronzes, Greek vases and Roman glass and silver are particularly important.

You can find the ancient Hellenic (and Roman) artifacts divided throughout the museum, although (sadly) not everything is currently available for viewing. In the hopes they eventually come online, this is the overview:

Ground Floor
Greece: Cycladic Islands (Room 11)
Greece: Minoans and Mycenaeans (Room 12)  The Arthur I Fleishman Gallery
Greece (1050-520 BC (Room 13)
Greek vases (Room 14)
Athens and Lycia (Room 15)
Greece : Bassae Sculptures (Room 16)
Greece: Parthenon (Room 18)
Greece: Athens (Room 19)
Mausoleum of Halikarnassos (Room 21)
The world of Alexander (Room 22) 
Greek and Roman sculpture (Room 23)

Upper Floor
Greek and Roman life (Room 69)
Roman Empire (Room 70)
The Wolfson Gallery
Etruscan world (Room 71)
Ancient Cyprus (Room 72) 
The A G Leventis Gallery
Greeks in Italy (Room 73)

Lower Floor
Greek and Roman architecture (Room 77)
Classical inscriptions (Room 78)

The collection can be accessed here through street view and the map here for refference,