The Rianxiño petroglyph is a fascinating example of Galician rock art. This prehistoric engraving, carved into a rock, features symbols that reflect the beliefs and lives of ancient communities in the region.

The A Foxa Vella petroglyph is one of the most outstanding examples of rock art in Rianxo. This prehistoric engraving is located in a natural setting of great scenic value, at the foot of Mount Pelotiña.

Mount Pelotiña is located 217 meters above sea level. It contains a significant number of representations dating back to the Bronze Age.

The Os Campos petroglyph complex is a diverse group of creations dating back to the Bronze Age, carved in stone. These carvings are spread across a large area, belonging to the parishes of Santa María de Leiro and Santa Comba de Rianxo, between A Pedreira and A Devesa de Rianxiño, and extending as far northwest as Alto do Corniño.

The petroglyphs of Os Mouchos, in the village of Brión, parish of Leiro (on the path leading to As Cunchas beach), are one of the most interesting and easiest to find groups of rock art in Rianxo.

The set of the mámoas dos Campiños, in the parish of Santa María de Leiro, forms an archaeological group of six burial mounds, which is listed as Cultural Heritage of Galicia.

The Moon Castle is one of the most iconic and outstanding historical remains of Rianxo. Located next to the coastline, in the middle of the Arousa estuary, today only the remains of what was once an important fort for surveillance and defence survive.

The parish of Bealo holds treasures well worth a visit. In addition to the hermitage of San Ramón de Bealo, the petroglyphs of A Laxe do Agoeiro are particularly noteworthy, a collection of multiple representations that give this place significant importance in the world of rock art.

The Neixón Castro is, without a doubt, one of the most significant fort complexes in the entire Northwest of the Iberian Peninsula, comprised of two settlements located on the Punta Neixón peninsula: the Small Castro and the Large Castro.

Very close to the sea and integrated into a recreational area, near the old fishing port of Cabo de Cruz, lies the Castro de Achadizo, one of the oldest in Galicia and therefore one of the most important.