Correct! Aurelian twice attacked the city of Palmyra, and brought Queen Zenobia back in chains the first time, and when the city revolted again, he razed it to the ground. Although future emperors would make some minor attempts to rebuild the city, it would fall into ruin before long.
Palmyra was a major Syrian city, ruled by Rome but in many ways autonomous, given how far it was from the center of imperial power. It's culture was a blend of Roman, Syrian, Greek, and other cultures, and was perhaps the greatest camel caravan city of the world to that point in time.
After the death of Marcus Aurelius, the last truly "great" classical emperor (who killed Christians in large numbers <_< ) the Roman Empire fell into a prolonged state of internal conflict, on and off... this led to a MAJOR series of wars which split the Roman Empire into three pieces; the Gallic Empire in the West (what is now France, Britain, the Iberian Peninsula, Belgium, and parts of Germany) the Roman Empire itself in the center (Italy, Greece, the Balkans, most of North Africa, parts of Asia Minor), and the Palmyrine Empire (Syria, parts of Asia Minor, most of today's Jordan, Egypt, and Israel/Palastine.)
Palmyra was later remade as the small city of "Tadmor", but even this declined and fell into ruins many centuries later...
Aurelian managed to reunite the empire, but did tremendous damage to it in the process. He also built the Aurelian walls which to this day partially surround the city of Rome. I used some of the ruins of Palmyra in my Fantasy Role-playing game...

Anyway, now that that lengthy exposition is done, it is your turn, Serris.