Today's museum building was started to be built as a Naval High School in 1884 but could not be completed. It was purchased by the Ministry of Culture in 1976. After its restoration was completed, it was converted into a museum and opened to service in 1982. Amasra Museum consists of four exhibition halls, two of which are ethnographic and two are archaeological. In the garden of the museum, there are stone works belonging to the Hellenistic, Roman, Eastern Roman, Genoese and Ottoman periods.

The castle was built in the Eastern Roman period and underwent serious repairs during the Genoese and Ottoman periods. The castle consists of two main masses: Sormagir Castle in Boztepe and Zindan Castle in Amasra. Sormagir Castle is connected to the land by "Kemere Bridge" and is reached by entering through the main arched door called "Dark Place" next to the bridge. Once the Dark Place is passed, the road on the left leads to Küçükliman (or Ancient Harbor) and the other road leads to Hacıdenizi. The eastern walls of the castle are 65 meters long and the southern walls are 300 meters long. Since the north and northwest of Sormagir Castle slopes into the sea in a very steep cliff, no walls were built here. Still today the castle gives the atmosphere of the Middle Ages with the stones with coats of arms of Genoa, and figures such as Eros, Medusa, eagle.