The Palace of Aigai sits on a low ridge a few hundred metres uphill from the Royal Tombs, and it is the single largest classical Greek building ever built. After more than a decade of meticulous restoration it reopened in early 2024, and the public can now walk through the rebuilt colonnades, see the mosaic floor of the andron, and stand in the throne room where the young Alexander was acclaimed king.
The site has good interpretation panels, but the scale is the point: the views over the plain to the south and the sheer footprint of the palace make clear how powerful Aigai was at the moment Macedon began its rise. Combine the visit with the tombs museum — they are part of the same archaeological park, with a combined ticket.