With its origins lost in the mists of time, much before the cataclysm of Deucalion...

"Now I will tell you the history of the Aegean islands beginning with Samothrace ... The island inhabited by indigenous ... it is said that in ancient times it was called Saonnisos ... The Samothracian say that before the cataclysms described by other civilizations, there was another great cataclysm during which opened close to "cyan stones" (the mythical Symplegades) and then (opened) the Hellespont.

Because the sea of the Black Sea was first a lake that inflated to the point that the stream pressure flowed forcefully the waters to the Hellespont and flooded much of the Asian coastline and a large part of the plains of Samothrace turned into sea. And this is why in later years some fishermen retrieve with their nets stone pillars, because even cities flooded from the water. And those escaped from the cataclysm fled to the higher parts of the island.

But as the sea was rising ever higher and higher, they asked from the local gods to save them and when latter did, in memory of the event they raised stone borders around the island and built altars. So it is obvious that Samothrace was inhabited before the flood "
Diodorus historic library 5.47

Located on the north coast, west of the ancient city. The oldest religious activity is placed in the 7th century BC while the permanent structures dating from the first half of the 4th century BC particularly on the 3rd century BC The sanctuary was dedicated to the worship and the ceremonies of the Mysteries of the Great Gods that was famous during the Greek and Roman antiquity. The gods are referred by the name of Kabeiroi which still remain unknown and enigmatic.

The first survey made by the French Consul M. Champoiseau in 1863 at the Winged Victory Monument. Followed by two more French missions in 1866 and 1891 in the hollow of the theater. The first systematic excavations were conducted in 1873 and 1875 by the Austrian A. Conze. Since 1938 the Sanctuary excavate the University of New York directed by K. Lehmann and then of J. R. McCredie. In 1956 five restored columns and the central architraves of the front of the sanctuary with the financial support of the Bollingen Foundation.

The most important monuments of the site are:
The "hall of choral dancers (Temenos)", The Sanctuary, The Palace, The Dome of Arsinoe, The Sacred Circle The Propylon of Ptolemy II, The Stoa, The Palace, The the Winged Victory Monument. (Source: www.e-evros.gr)

Externally seemed that the dome consists of two floors. A platform of two levels lead to the monument entrance to the south side and bottom of the building, which was a closed drum. The "second" floor was a psefdoptero by Doric pillars, which supported full Doric entablature. The openings between them closed in the lower part parapet, decorated a rosette between two bucrania and curtains.

Inside the Corinthian columns inherent integration with external pillars supporting an Ionic entablature. Among them, in correspondence with the outer parapet, altars decorated alternating pairs of flasks and bucrania. (Source: www.xanthi.ilsp.gr)

Along the long wall of the building protruding internally eight pillars,  four on each side, built with angled stones, which were used to support the roof beams while an intermediate wall formed on the elevated northern part of building an inner sanctuary, a small holy sanctuary, where the entrance was allowed only after the initiation. Two bronze statues of Kaveires with raised hands framed doorways that interrupted the wall of the inner sanctuary and perhaps underlie a wooden bulkhead that separated the sanctuary from the main hall.

The floor of the palace was earthen, while the interior walls and the pillars were coated with white plaster. The notches along the east wall and part of the north testify that there was a wooden platform. In the southeast corner of the main hall was one stone construction, which surrounded a pit libations, while the center of the room, near the eastern wall, detected the remains of a wooden circular pedestal.(Source: www.xanthi.ilsp.gr)

Also, at the mouth of the River Fonias, 8km. southeast of Therma, survived the so-called Tower Fonias, probably built after 1431. It has a square ground plan 11,5x11,5m. with preserved height 12m., while the walls more than 2 m thick., made of semi carved river stones. (Source: kastragr.blogspot.gr)