The entrance to the tomb consists of a
dromos with walls of
ashlar in conglomerate. Similarly, the
stomion is built from the same element. The exterior façade of the stomion is decorated with half-columns made of
gypsum which were carefully carved with ornate capitals and vertical fluting. Through the lintel block a small drain is cut in the rock, lined with low rubble walls and roofed with small slabs. Above them two stones are set to take the direct pressure off the covering slabs. The surface of the tomb was covered with coat of white
plaster. However, the Tomb of Clytemnestra displays slightly more advanced technical features with rows of curved stones continuing around the structure at the same level of the lintel. This may indicate that the Tomb of Clytemnestra was a slightly later construction compared to the one of Atreus. Architectural features of this specific tomb such as the semi-column were largely adopted by later classical monuments of the first millennium BC, both in the Greek and Latin world. ==Excavations==