The most attractive and the most beautiful natural creation of this kind, in the area of the entire Mediterranean. The grotto is located in the Lustica Peninsula, its sea level surface is 100 square metres, and the interior is round-shaped, with the ceiling shaped as vault.

Mamula (colloquial name for Lastavica) is an uninhabited islet in the Adriatic Sea, within the southwestern Montenegrin municipality of Herceg Novi.During the period of the Venetian Republic rule, the island was known as Rondina. The island has a fort, built in 1853 by Austro-Hungarian general Lazarus von Mamula. The fort takes up about 90% of the island's surface area. Along with the fortification on Prevlaka's Cape Oštro as well as Arza fortification on Luštica's Cape Arza, both of which were erected at the same time also on suggestion by general Lazarus von Mamula, fort Mamula was part of the Austro-Hungarian Army's contingency plans of preventing the enemy entrance into the Bay of Kotor.

Near a small village called Rose, there are three most impressive Submarine Tunnels which were built by the Yugoslav Army. The outside of the opening is designed and covered by fake rocks so they would not be invisible to satellites or spy planes. One of the tunnels is out towards the open sea and Mamula island, the other two are about 1-2 km towards Tivat direction. There are also a few abandoned Yugoslav Navy ships around. All tunnels are dead ends, so you cannot swim through, but you can swim to the end and back. You can also walk alongside and explore on your own. It is pretty dark at the end, so having a torch helps. There are also other walking tunnels diverting from the main submarine tunnel. Get off and explore the secret tunnels, go for a swim or if you are truly brave- dive off from the top of the cave into the sea.