A considerable number of town forts were preserved on the highest and the most outstretched point of the town towards the island mainland. Amongst these the powerful tower of St. Christophor stands out. known among people as tarjun (the word derives from Venetian word "torrione" the big tower). It has an asymmetrical ground plan of the medieval basis with the outspread corner part, which was erected in the renovation after the town riots and fights on the occasion of the Venetian occupation in the twenties of the 15th century.

The top of the tower is a panoramic belvedere with an outstanding view of the town, the island and the open sea. The town wall extends from the tower towards the east and has preserved its length reaching the remnants of the monastery of St. Ivan (John) and the tower Kula smjelih (Tower of the Courageous) or Gagliarda towards the north. The gate in the wall under the tower was broken through in the recent times after the town park was set up.

A small church was erected here in the medieval age (the documents of the 14th century mention it) and it was named after the town protector St. Christophor. the same protector the tower was named after. It is a simple one-naval structure with rectangular foundation and no apse. The portal, the oval facade window along with those on the eastern and the northern wall can be dated back to the 15th century. Already in the medieval age, it was an assembly place of the powerful brotherhood of St. Christophor. In the beginning of the 19th century it was desacralized and abandoned and its inventory was moved to other churches, such as. the carved representation of the Saint's Work from the middle of the 15th century made by a wood carver. Petar de Riboldis. which is now preserved in the cathedral.

The church has recently been restored and it now comprises the town collection of stone monuments with fragments of sacral and profane sculptural-architectonic Antique and Baroque decorations.