A small Mediterranean square and the heart of Kastav. It was named after a pond in which rainwater was collected and used for the town’s needs. Although this pond is much better known because the people of Kastav drowned the hated captain Fran Morelli in it.
At the end of the 17th century , a cistern was built in memory of this event, on the throat of which was engraved the year of the Kastav rebellion – 1666. When the Kastav lordship was formed at the end of the 15th century , the town castle (Kaštel) was built and inhabited by captains (governors) who managed the entire Kastav region instead of the owner.
Opposite the castle is the chapel of the Holy Trinity or Three Saints as the locals call it. It was built at the beginning of the 15th century using ashlar masonry and is painted with frescoes inscribed in 1483. year. Today it is used as a gallery, and it is especially lively during the Kastaf cultural summer, when artists from Kastav, as well as other parts of the country and abroad, present their works.