Fortress in Herceg Novi were built in the period from XV to XIX century. Three of them are located at the entrance to the Strait leading to the city. All are built in the era of the Austrian-Bulgarian intervention of the XIX century. On the right hand - Arzano, on the left - Prevlaka, in the center - Mamula. Up to now, all three of the fortress have been preserved in its original form, they are not subjected to restoration.

Desert island Mamula is home to the fortress of the same name. It was built at the initiative of the Austrian general. Fortress, during both world wars, served as a prison, to protect the city, it was not used.

Forte Mare Fortress and Citadel are located on the south by the sea. The Citadel was originally owned by Venetian builders, after which it was rebuilt the Turks and then the Austrians. In the XVI century it was called "unshakeable tower." The earthquake in 1979 seriously damaged reinforcement, leaving only part of the old walls.

Forte Mare, or else "sea fortress", built in the period between the XIV and XVII centuries on the cliff above the sea runs along the road. In 1833, the castle has undergone renovation in 1952, she served for residents summer cinema, then was converted into a dance club.

In the north of the old town survived another fortress Kanli Kula defense, known as the "bloody tower". It was built by the Turks in the XVI century above sea level by 85 meters. First, a protective function, was later converted into a prison. In 1966, the castle completely reconstructed, and then it turned into a concert hall with a total seating capacity for 1000 people.

Also, the Turks were built following the urban fortress: in the XV-XVI centuries Shpanola was built in the northwest, on the top of the mountain Baer; in the middle of the XVII century - Sat Kula (tower-chapel), which during the reign of the Turks served as the main entrance to the city.

The most famous - city tower of St. Jerome, which was erected on the eastern wall of Herceg Novi in ​​1687, when the city was liberated from the Turks Hieronymus Korner.