This category is composed of a group of protected or non-protected immobile objects that indicate to profane or sacral architectural heritage related to the history of maritime development on the Northern Adriatic. Here are examples of administrative buildings of shipping companies, harbors, maritime schools, shipyards, port warehouses, ship equipment factories and fish factories, fish markets etc. Here are presented different phases of building of some objects and their historical importance i.e. role that they played during the 19th and 20th centuries. Some objects of maritime architecture are on the list of the protected heritage in Slovenia or in Croatia.