The caves located in the territory of Siniscola are of great archeological and naturalistic importance; you can visit them also inside and thus enjoy their millennial silence.
Among the main ones there are:
The Elne Portiche cave.
It is located on the western slope of Monte Lattu where you can find clear traces of human presence dating back to the Neolithic, where fragments of decorated vases dating from the second half of 5000 BC, fragments of obsidian, human bones and bones of the "Prolagus Sardus "(rodent typical of Sardinia now extinct) were found in the surrounding soil.
Sa Prejone 'e S'Orcu.
It is located on the eastern side of Monte Albo. It is a unique underground temple, a peculiar megalithic monument used as a burial place and for cult in the Nuragic era. It consists of a narrow, hidden entrance, an elbow shaped stairway with about twenty steps of the type found in holy wells of a more archaic class, a wall to block the mouth of the natural cave and a salt complex; it appears to be a prehistoric type of monument. Inside there are clear traces of frequentation during the Nuragic era.
It is a cave of archaeological interest located on Monte Albo and has two entrances; the southern entrance is accessible from the outside; the northern one is open on the precipice, with a wide panorama of the coast. An oblique wall was erected inside facing north-west but, nowadays, only the basement is visible because it has been demolished. There are two recesses on the right. A fragment of the wall of the crater with red figures was also found in the cave.
Sa Conca ‘e Locoli.
It is located in the Municipality of Siniscola. It's an underground river resurgence. The first section of the cave is about 400 metres long and ends with a siphon beyond which it has been explored for another 1500 meters This is the end cavity of an underground stream exposed to the erosion of the rushing water discharged in overflow periods. The river flows inside the cavity for several kilometres, also along various branches. Recent surveys have highlighted a link between the cave and the northern slopes of Monte Albo as well as a connection with the Fruncu 'e Oche spring near the Church of St. Joseph. Hydrogeological studies and surveys on the internal route showed its water potential. From here the route continues with a steep walk to the top of Mount Albo, tracing the paths of the nineteenth-century loggers, charcoal burners and shepherds to reach Punta Su Mutrucone and Punta Caterina and the northern slopes of the mountains that lead to the municipalities of Lodè and Lula.
Gana ‘e Gortoe.
You can visit this cave which is accessible from the town of Siniscola (Via Olbia). It was used since prehistoric times (as evidenced by the pottery found in it) and also during the 1900s as an air raid shelter. An underground stream flows inside and it is inhabited by a species native to the Siniscolese territory: the Geotritone of Monte Albo. The entrance, located on the left side, consists of a large cavity in the rocky wall. This is the end section of a winding underground stream which, over time, has eroded the rock of the entrance creating its particular shape. Upon entering you will see a gallery, narrow and high in the beginning, the vault of which becomes gradually lower. After several metres you reach a crack in which you must proceed low to the ground for a few metres to gain acces to the lower gallery. The path inside the cave has been subjected to thorough speleological investigation: it consists of eroded areas of varying width shaped by water and karstic lakes like the one called s'abba de Buda (water of Buda), with stalactites and conformations of considerable charm. The water of the underground stream flows out of the cave also in summer when the wind is raging; then it ceases until winter and continues until May. The underground river creates an external stream of water which emerges a little further down in via Matteotti where in the late nineteenth century they built a public laundry which can still be visited.
The assistance of experts and use of appropriate technical equipment is recommended for the visit inside the cave .