In 2012 Greek archaeologists unearthed a large tomb within the Kasta Hill, the biggest burial mound in Greece, northeast of Amphipolis. The large size and quality of the tumulus indicates the prominence of the burials made there, and its dating and the connections of the city with Alexander the Great suggest important occupants. The perimeter wall of the tumulus is 497 m (544 yd) long, and is made of limestone covered with marble.

The tomb comprises three chambers separated by walls. There are two sphinxes just outside the entrance to the tomb. Two of the columns supporting the roof in the first section are in the form of Caryatids, in the 4th century BC style. The excavation revealed a pebble mosaic directly behind the Caryatids and in front of the Macedonian marble door leading to the "third" chamber. The mosaic shows the allegory of the abduction of Persephone by Hades, but the persons depicted are Philip and Olympias of Macedon. Hades' chariot is drawn by two white horses and led to the underworld by Hermes. The mosaic verifies the Macedonian character of the tomb. As the head of one of the sphinxes was found inside the tomb behind the broken door, it is clear that there were intruders, probably in antiquity.

Fragments of bones from 5 individuals were found in the cist tomb, the most complete of which is a 60+ year old woman in the deepest layer. Dr. Katerina Peristeri, the archaeologist heading the excavation of the tomb, dates the tomb to the late 4th century BC, the period after the death of Alexander the Great (323 BC). One theory is that the tomb was built for the mother of Alexander the Great, Olympias.

Restoration of the tomb is due for completion in 2023 in the course of which building materials of the grave site which were later used by the Romans elsewhere will be rebuilt in their original location.

View
https://en.wikipedia.org/wiki/Kasta_Tomb
and
http://amphipolis.info/?lang=en
for more information