Kaštel in Pula, located at Gradinski uspon, is a historic Venetian fortress that sits atop a hill overlooking the city and the Adriatic Sea. Built in the 17th century by the Venetians, Kaštel was strategically designed to protect the city and its valuable harbor from invaders. Today, it remains one of Pula’s most iconic landmarks, offering visitors a blend of military history, stunning architecture, and breathtaking panoramic views of the surrounding area.

What makes Kaštel unique is its star-shaped design, typical of Venetian fortresses from that era. The structure was built on the remains of earlier fortifications, symbolizing Pula’s long and varied history of defense and occupation. Its location on a hill makes it the highest point in the city, providing a commanding view of Pula, including its famous Roman amphitheater, the Arena, and the coastline stretching into the distance.

The best time to visit Kaštel is during the late spring and summer months when the weather is ideal for exploring the fortress grounds and enjoying the views from the hilltop. The fortress is also a popular venue for cultural events, especially during the summer when it hosts open-air concerts, art exhibitions, and festivals. Visitors can explore the fortress at any time during its opening hours, but there is a small entry fee to access the interior and exhibitions inside.

One of the most fascinating aspects of Kaštel is its underground tunnels, known as Zerostrasse, which were constructed during World War I as part of the city’s defense system. Today, these tunnels are open to visitors and offer an intriguing look into Pula’s military past. The fortress also houses the Historical and Maritime Museum of Istria, which features exhibitions on the region's naval history, archaeology, and ethnography.

There is a local legend that suggests the site where Kaštel stands was once home to a Roman citadel, and it is said that treasure might still be buried beneath the fortress, hidden away by fleeing Roman rulers.

Though Kaštel hasn’t been a prominent filming location, its dramatic setting and historical significance make it a popular backdrop for documentaries and local cultural projects. Whether for the history, the views, or the cultural events, Kaštel is a must-see for visitors to Pula, offering an enriching and memorable experience in one of Croatia’s most historic cities.