Thus Bostan, the last relic of the Sasanian Empire

Taq-e Bostan (ancient arch) is a collection of petroglyphs and inscriptions from the Sassanid period located in Iran in the Taq-e Bostan region in the northeast of the city of Kermanshah and western Iran. This complex was built in the third century AD and has great artistic and historical value.
Thus Bostan, the last relic of the Sasanian Empire, is considered one of the oldest and most beautiful ancient works of Iran.