This is the castle of Arad from Transylvania:
The town was taken by the Turks in 1551 and the Turks built a new palisade fort. During the Turkish rule (1551-1687) it was a strategic borderland castle of the Ottomans but its trading function was even larger. The famous Turkish traveler, Evlija Cselebi was writing about Arad in detail. It doesn’t mean Arad had a peaceful time… During the 15-year-war, the castle was retaken by Zsigmond Báthori in 1595 for a while. He gifted collective nobility to the Serbian soldiers who had defended heroically the castle of Lippa and they were given the town of Arad for their services.
When Gábor Bethlen became the Prince of Transylvania (1613-1629), he had to give the fully destroyed Arad back to the Ottomans, along with Lippa. He was not loved for this deed by the Hungarian warriors: the warriors of Lippa even had to be besieged to force them to give their fort back to the Turks. But this was the price for gaining his title: Bethlen needed the Turks’ support at the beginning. Prince György Rákóczi II (1648-1660) could take Arad back again, chasing away the Turkish garrison and putting the palisade on fire. The Turks took the forts along the river Maros back a bit later and they rebuilt the castle of Arad. It was retaken by the “liberators” in 1685 but ceased to be a borderland castle in 1718. The present fortifications were mostly built by the Habsburgs.
You can find more pictures here: