Darius the Great (550–486 BCE) Under his reign, the Persian Empire reached the pinnacle of its power and the fullest extent of its size. His domain consisted of over 40 different ethnic tribes, and stretched from India to the Balkans covering almost three million square miles .
Gate of all nations or Gate of Xerxes located at the ancient city of Persepolis. 70 km northeast of the modern city of Shiraz in the Fars Province of modern Iran. Xerxes, who built this structure, named it "The Gate of All Countries" during the Persian empire. Xerxes I is believed to be the Persian king identified as Ahasuerus in the biblical book of Esther.
Persepolis, Iran. Envoys bearing tribute march eternally up a ceremonial staircase in the spectacular ruins of Persepolis, capital of the once mighty Achaemenian Empire, which during the time of Xerxes (486-465 B.C.) had dominated the civilized world. Photograph by Simon Norfolk