Atop the highest hill in the city of Pula sits the Historical and Maritime Museum of Istria, housed within the ancient Venetian fortress of Kaštel. This is a unique location in Croatia where 17th-century military architecture meets a rich seafaring heritage. The star-shaped fort, designed by a French engineer, is a landmark in its own right, offering tourists breathtaking panoramic views of the Adriatic Sea and the terracotta roofs of the old town.

The museum's exhibition covers key stages of the Istrian region's development, with a strong focus on its maritime past. Within the fortress walls, visitors can explore the history of shipbuilding, nautical charts, antique weapons, and everyday items illustrating local life over the centuries. The museum's collections include thousands of exhibits spread across thematic sections, from medieval artifacts to industrial-era objects.
One of the museum's most intriguing features is its link to the underground: visitors can descend into the Zerostrasse tunnels, which run directly beneath the fortress. Today, the courtyard of Kaštel serves as both a museum space and a cultural venue for open-air concerts and theatrical performances, making a visit here a truly multi-faceted experience.