Relatively smaller but a far more impactful experience for me than Persepolis, helped by not knowing anything about it. It was quite a sight to head down the road from Persepolis to find four huge cross shaped tombs belonging to Artaxerxes I, Darius I, Darius II, and Xerxes I, carved into the hillside above. Originally they were even higher up but the land has risen over the past two thousands years.
Even more impressive was the still mysterious Bun Khanak, a crisp 2,500 year old square tower.
Hundreds of years later during the Sassaian period seven stone reliefs were added below.
Magnificent!