It is difficult to envision how Persepolis looked during the times of the Persian kings Darius, Xerxes and their successors, as parts of this ancient ceremonial city are in ruins. Architects Kourosh Afhami and Wolfgang Gambke, with the use of computer technology have undertaken a massive project whose detail is unparalleled. Their visual reconstructive efforts have resulted in capturing how Persepolis may have looked using suggestions by archaeologists, combined with personal interpretation. The following link will direct you to their work progress Persepolis3D.com.
As can be viewed below, Kourosh Afhami and Wolfgang Gambke's digital recreation compares the images of how Persepolis appears today with how Persepolis looked during ancient times.
The Gate of All Nations
The Gate of All Nations - View I - courtesy Kourosh Afhami & Wolfgang Gambke
The Gate of All Nations - View II - courtesy Kourosh Afhami & Wolfgang Gambke
Apadana facade - (Audience Hall)
Apadana (Audience Hall) - courtesy Kourosh Afhami & Wolfgang Gambke