Castle Rotondo - Credit: Wikimedia Commons
Castle Rotondo is a fortress castle in Kaštel Štafilić, Croatia, on the Adriatic coast. It was fully constructed in 1508, on the order of Stefano Štafileo, a Trogirian nobleman. Stafileo ordered its construction in 1508 to protect his lands and the Kozjak's peasants from the Ottomans pillaging. It is situated by a beautiful sea cliff. Read more on Wikipedia
Source: en.wikipedia.org