Tomb of Casta is the name of the circular hill in the area of ancient Amphipolis at a distance of about 900 meters southeast from the village of Nea Mesolakkia Serres.

It is also known as the tomb of Amphipolis, a name derived from the Macedonian funerary monument of the early Hellenistic period, which was discovered inside the hill.

In the mid-1950s and until the 1970s, excavations were carried out on the surface of the mound where a set of modest graves dating from the Iron Age were discovered.

The area began to be excavated around the perimeter again in 2012 by the archaeologist Katerina Peristeri and was shown to the general public in August 2014, the point in time when the first finds were also discovered on the south side of the mound where the burial monument of the excavations is located ongoing. Three chambers and a total of four spaces including the entrance and steps to the interior of the tomb were discovered.

The marble enclosure of the circular mound has a perimeter of 497 meters and its area corresponds to about 20 acres, which makes it as a whole as a burial monument the largest ever discovered in Greece, and one of the most important archaeological discoveries of 2014 internationally. In the fourth area, a grave was found with bones belonging to 5 people - as well as the remains of a horse skeleton - with the skeletons not being complete.