Legend has it that on July 22, 1452, sailors found an icon of the Mother of God with a child, on a rock in the middle of the sea. Since that day, there has been a tradition that sailors, after returning from a successful voyage, lay stones along the shore of Our Lady of the Rocks. This man-made islet has been built for centuries. Its foundations in the depths of the bay are hidden by hundreds of worn-out sailing ships, which were filled with stone and sunk, so that the island could still stand above the water.

Inside the museum, it is possible to see numerous historical objects from different epochs, which were donated to the islet. Amphoras from the second century BC, weapons from the 18th and 19th centuries, over 250 paintings of boats and sailing ships that throughout history were called Our Lady of the Rocks. There are over 2000 silver votive tablets, which are hung on the walls of the church. Votive tablets have been brought to the church since the 17th century, and are a gift from sailors who survived a shipwreck or an accident at sea. The dome of the church, the so-called The Marian cycle is the work of the famous baroque painter Tripo Kokolja from the 18th century. Popularly called the Sistine Chapel of Boka, because it was built on the same principle as the dome in the Vatican.