Which major accomplishment was achieved by darius i of persia

Darius I (550-486 B.C.) was the third Persian King of the Achaemenid Empire. During his reign, the Persian Empire reached its peak. He founded Persepolis  in 515 B.C. and this was his major accomplishment. It is believed that this was the capital of Persia during his reign. Persepolis had a ceremonial function since it was used to celebrate the Persian New Year and it was considered one of the greatest constructions of the ancient world. Darius' role is important because he was the one that built the palaces: there are even  Inscriptions on the buildings that support the idea that they were constructed by Darius.

Darius I, also known as Darius the Great, was the third Persian King of the Achaemenid Empire. His reign served 36 years, from c. 522 to 486 BCE;

after a more than a decade and a half of combating al qaeda (aq) in afghanistan and pakistan,

the united states faces a diverse array of threats from al qaeda affiliates in the middle east and

africa. while senior al qaeda figures reportedly remain based in pakistan, the network includes

a number of affiliates across the middle east and africa including al qaeda in the arabian

peninsula (aqap), al qaeda in the islamic maghreb (aqim), and al shabaab. al qaeda also

retains a small but possibly growing presence in afghanistan. u.s. officials have stated that al

qaeda still maintains a foothold in syria through its ties to hay’at tahrir al sham (formerly

known as the nusra front), though the exact nature of that relationship may be evolving. this

report examines the threat posed by al qaeda affiliates in the middle east and africa as described

by u.s. officials and outside observers, as well as the u.s. approach to date in responding to these

threats. this was all i could find hope this : )