If I could give it 6 stars I would do it. The level of craftsmanship shown in the delegations at Apadana for me is simply mindblowing. I visited Angkor several months after Persepolis and looking at the Khmer details, I felt slightly disappointed (I know that limestone and sandstone are not the same, but still). It takes a good guide (and not a lot of people around) to point out the intricacies of the delegations (ribbons on shoelaces, fingers bent while carrying vessels, various headgears). I am still in awe even now, 2 years after.